Organ in the lower part of the thorax that produces a secretion.
Ec[000000]f[16]LBabdominalB
Pertaining to the part of the thorax between the chest and the pelvis. This region of the body includes the stomach, intestines, and other organs of the digestive system, as well as some of the organs of the excretory and reproductive systems.
Ec[000000]f[16]LBaberrantB
Not in accordance with type.
Ec[000000]f[16]LBadolescentB
Immature; on the verge of adulthood.
Ec[000000]f[16]LBaestivateB
To spend the summer dormant or inactive; for example, some snakes.
Ec[000000]f[16]LBaffiliationB
Association.
Ec[000000]f[16]LBaggregationB
Grouping.
Ec[000000]f[16]LBagonisticB
Combative. Ec[000000]f[16]LBalar membraneB
A thin layer of tissue covering the wings.
Ec[000000]f[16]LBalbinoB
Animal that lacks normal pigmentation; albinos typically have white skin or fur and pink eyes.
Ec[000000]f[16]LBaltricialB
Describes animals that need care or nursing after birth.
Ec[000000]f[16]LBalveoliB
Thin, capillary-rich sacs where oxygen and carbon dioxide exchange takes place; pits on an organ's surface.
Ec[000000]f[16]LBambiguitiesB
Uncertainties.
Ec[000000]f[16]LBamnioteB
Any animal that has a fluid-filled membrane that protects it in its embryonic stage. Reptiles, birds, and mammals are all amniotes.
Ec[000000]f[16]LBamniotic eggsB
Eggs that have a tough, fluid-filled sac in which the embryo develops.
Ec[000000]f[16]LBamnioticB
Having an innermost membrane of a sac that encloses the embryo of a mammal, reptile, or bird, and is filled with a watery fluid.
Ec[000000]f[16]LBamorphousB
Describes something that is without definite form.
Ec[000000]f[16]LBampullaB
Dilated portion of a duct or canal; for example, the semicircular canal of the ear, or the milk duct of the mammary gland.
Ec[000000]f[16]LBancestryB
Genetic heritage, usually beyond grandparents.
Ec[000000]f[16]LBanemiaB
Condition in which the blood is deficient in its oxygen-carrying abilities.
Ec[000000]f[16]LBanimosityB
Ill will; hostility.
Ec[000000]f[16]LBanteriorB
At or toward the front.
Ec[000000]f[16]LBanthropoidB
Resembling man or ape; belonging to the suborder that includes Old and New World monkeys.
Ec[000000]f[16]LBantidiureticB
Working against dehydration; something, such as water, that prevents dehydration.
Ec[000000]f[16]LBantlersB
Hornlike bony growths, usually elongated and branched. Antlers, which are found on members of the deer family, including moose and elk, are shed once a year.
Ec[000000]f[16]LBaphrodisiacB
A food or drug that stimulates or intensifies sexual arousal.
Ec[000000]f[16]LBapicalB
Relating to the tip of an object.
Ec[000000]f[16]LBappendageB
Limb or subordinate body part; for example, an arm or leg.
Ec[000000]f[16]LBarbitraryB
Determined by chance.
Ec[000000]f[16]LBarborealB
Pertaining to trees.
Ec[000000]f[16]LBarchetypeB
Original from which others may derive.
Ec[000000]f[16]LBarthropodB
Invertebrate animal with a chitinous exoskeleton and a segmented body to which pairs of antennae, wings, or legs are attached; for example, insects and arachnids.
Ec[000000]f[16]LBartiodactylB
Mammal with complex stomach and cloven hoof; for example, swine, sheep, and cattle.
Ec[000000]f[16]LBassemblageB
Collection of persons or things.
Ec[000000]f[16]LBatriumB
A chamber or cavity, especially one of the two chambers of the heart that receives blood.
Ec[000000]f[16]LBautonomicB
Self-governing; involuntary nervous system.
Ec[000000]f[16]LBbacteriaB
Unicellular, prokaryotic microorganisms that reproduce through fission or by forming spores. Some types of bacteria cause disease.
Ec[000000]f[16]LBbaleenB
Horny plates attached to the upper jaw of a whale, also called whalebone; a type of whale that has such plates.
Ec[000000]f[16]LBbenignB
Kind and gentle; not dangerous.
Ec[000000]f[16]LBbenthicB
Pertaining to the bottom of a sea or ocean.
Ec[000000]f[16]LBbilateral symmetryB
A condition of most animals in which the body is divided into two halves that are more or less identical.
Ec[000000]f[16]LBbingeB
To indulge in food or drink; an indulgence in food or drink.
Ec[000000]f[16]LBbinocularB
Having to do with using both eyes at the same time.
Ec[000000]f[16]LBbinomialB
Having two names: genus and species.
Ec[000000]f[16]LBbipedalB
Having two legs; describes animals, such as humans, that walk upright on two legs.
Ec[000000]f[16]LBblubberB
Fat found on marine mammals, such as whales, that serves as insulation and a food reserve.
Ec[000000]f[16]LBbotanistB
One who studies plant life.
Ec[000000]f[16]LBbovid hornB
Hard, hollow structure projecting from the head of bovids.
Ec[000000]f[16]LBbovidB
Hoofed, hollow-horned ruminants; for example, sheep, goats, and cattle.
Ec[000000]f[16]LBbovineB
Of or relating to a mammal of the genus IBos.I
Ec[000000]f[16]LBbrachiateB
To move by swinging from branch to branch; for example orangutans.
Ec[000000]f[16]LBbrackishB
Somewhat salty.
Ec[000000]f[16]LBbronchiB
Tubes that connect the trachea with the lungs.
Ec[000000]f[16]LBbrowseB
Tender shoots, twigs, and leaves; also refers to the feeding on such.
Ec[000000]f[16]LBBubonic plagueB
A contagious often fatal disease usually transmitted by fleas from rats.
Ec[000000]f[16]LBbulbousB
Rounded, swollen, or bulb-shaped; having bulbs.
Ec[000000]f[16]LBcamouflageB
Concealment by protective coloring.
Ec[000000]f[16]LBcancellousB
Describes bones that have an open, latticed, or porous structure.
Ec[000000]f[16]LBcanidB
Doglike member of the family Canidae.
Ec[000000]f[16]LBcanineB
Cone-shaped, pointed tooth; a dog.
Ec[000000]f[16]LBcapillariesB
Network of minute blood vessels where some products are absorbed and others are given off.
Ec[000000]f[16]LBcarcassB
Dead body of an animal, usually food for scavengers.
Ec[000000]f[16]LBcarnassialB
Describes a tooth that is adapted for tearing flesh.
Ec[000000]f[16]LBcarnivoreB
Flesh-eater.
Ec[000000]f[16]LBcarrionB
Dead and decaying flesh; often food for scavengers.
Ec[000000]f[16]LBcartilaginousB
Consisting of firm, elastic connective tissue; gristly.
Ec[000000]f[16]LBcategorizeB
To classify; to separate into groups of similar things.
Ec[000000]f[16]LBcelluloseB
Structural material of green plants.
Ec[000000]f[16]LBcerebellumB
Fourth division of the brain, controls muscular coordination.
Ec[000000]f[16]LBcerebralB
Pertaining to the brain.
Ec[000000]f[16]LBcervidB
Related to or resembling a deer.
Ec[000000]f[16]LBcetaceanB
Pertaining to whales or dolphins.
Ec[000000]f[16]LBchordateB
Any animal that has a backbone.
Ec[000000]f[16]LBclanB
A group that has a common ancestor.
Ec[000000]f[16]LBcloacaB
In reptiles, birds, amphibians, and many fishes, the chamber into which the intestines, genitals, and ureter open.
Ec[000000]f[16]LBcoagulationB
The clotting or solidification of a substance, such as blood.
Ec[000000]f[16]LBcoelenteronB
Gastrovascular cavity of a coelenterate or cnidarian, such as a jellyfish.
Ec[000000]f[16]LBcoelomB
Main body cavity of most multicellular animals, separate from the gut, that contains the heart, lungs, and intestines.
Ec[000000]f[16]LBcohesiveB
United.
Ec[000000]f[16]LBcohesivenessB
Ability to remain together.
Ec[000000]f[16]LBcolonizationB
Establishment of a new center of population.
Ec[000000]f[16]LBcommensalB
Relating to a symbiotic relationship in which one organism is benefited and the other is neither benefited nor harmed.
Ec[000000]f[16]LBcompartmentalizationB
Division into separate units or sections.
Ec[000000]f[16]LBconceptionB
Production of a viable zygote; fertilization of an egg by a sperm.
Ec[000000]f[16]LBconciliatory ritualB
A ceremonial act of appeasement.
Ec[000000]f[16]LBconfigurationB
The arrangement of parts.
Ec[000000]f[16]LBconformityB
The condition of being in agreement.
Ec[000000]f[16]LBconservationB
Acting to preserve from loss or damage.
Ec[000000]f[16]LBcontaminateB
To make dirty or impure.
Ec[000000]f[16]LBcontemporaryB
Of the same time or age; current.
Ec[000000]f[16]LBcontractileB
Capable of contracting; able to be withdrawn.
Ec[000000]f[16]LBconventionB
Usage or custom.
Ec[000000]f[16]LBcopepodsB
Parasitic crustaceans with no carapace, or protective covering on its back.
Ec[000000]f[16]LBcopulateB
To engage in sexual intercourse.
Ec[000000]f[16]LBcorneaB
Transparent, convex portion of the eye that covers the iris and pupil.
Ec[000000]f[16]LBcornifiedB
Condition in which the epithelial cells have changed into horny matter, such as hair and nails.
Ec[000000]f[16]LBcraniumB
The skull.
Ec[000000]f[16]LBcretinismB
Abnormal development marked by stunted growth and mental retardation.
Ec[000000]f[16]LBcriterionB
Standard on which a decision is made.
Ec[000000]f[16]LBcud-chewerB
Animal that chews food that has been regurgitated from its first stomach into its mouth; for example, a cow.
Ec[000000]f[16]LBcullB
To select out.
Ec[000000]f[16]LBcuticleB
Outermost epidermic layer.
Ec[000000]f[16]LBcytologicalB
Pertaining to cells.
Ec[000000]f[16]LBDDTB
An insecticide that is toxic when swallowed or absorbed through the skin.
Ec[000000]f[16]LBdecipherB
To decode.
Ec[000000]f[16]LBdeduceB
To infer from general principle.
Ec[000000]f[16]LBdefecateB
To remove feces from the bowels.
Ec[000000]f[16]LBdeoxygenateB
To remove oxygen.
Ec[000000]f[16]LBdescendantB
Individual derived from a certain family or ancestor.
Ec[000000]f[16]LBdetrimentalB
Harmful.
Ec[000000]f[16]LBdiaphragmB
Rigid partition in the body, between the chest and abdomen, that is needed in respiration.
Ec[000000]f[16]LBdichotomousB
Describes something that is divided into two equal or repeated parts.
Ec[000000]f[16]LBdifferentiateB
To develop different characteristics.
Ec[000000]f[16]LBdigitigradeB
Walking only on one's toes; any animal that does this, such as cats, dogs, and horses.
Ec[000000]f[16]LBdiscontinuousB
Not continuous; having a break or interruption.
Ec[000000]f[16]LBdisproportionateB
Lacking symmetry or relation.
Ec[000000]f[16]LBdistensibleB
Capable of expanding.
Ec[000000]f[16]LBdiurnalB
Pertaining to daylight hours or plants and animals that are active during the day; opposite of nocturnal.
Ec[000000]f[16]LBdivergentB
Differing from each other.
Ec[000000]f[16]LBDocileB
Easily taught or managed.
Ec[000000]f[16]LBdominateB
To rule or control.
Ec[000000]f[16]LBdormancyB
Period of sleep or inactivity; characteristic of some animals in the summer or winter.
Ec[000000]f[16]LBdormantB
Describes something that is asleep or inactive for an extended period of time.
Ec[000000]f[16]LBdorsalB
Of, on, or near the back.
Ec[000000]f[16]LBdurationB
Continuance in time.
Ec[000000]f[16]LBecholocationB
Method by which some animals, such as bats, locate objects through echoes.
Ec[000000]f[16]LBecologicalB
Pertaining to the relationships between organisms and their environments.
Ec[000000]f[16]LBectodermB
Outer layer of cells in mammals. Skin, hair, nails, and the enamel of teeth develop from this layer.
Ec[000000]f[16]LBectoparasiticB
Having to do with an ectoparasite, or a parasite, such as a lice or flea, that lives on the exterior of its host.
Ec[000000]f[16]LBedentateB
Without teeth.
Ec[000000]f[16]LBefferentB
Carrying outward from a central organ, nerve, or point.
Ec[000000]f[16]LBelongateB
To grow or make longer.
Ec[000000]f[16]LBemblematicB
Symbolic.
Ec[000000]f[16]LBembryoB
An organism in its early stages of development.
Ec[000000]f[16]LBencroachmentB
Advancement beyond usual limits.
Ec[000000]f[16]LBendemicB
Prevalent in a particular region.
Ec[000000]f[16]LBendocrineB
Secreting internally.
Ec[000000]f[16]LBendodermB
Inner-most tissue derived from embryonic layer. The lining of the organs of the digestive system develops from this.
Ec[000000]f[16]LBendoparasiticB
Having to do with an endoparasite, or a parasite, such as a tapeworm, that lives in the interior of its host.
Ec[000000]f[16]LBenterocoelyB
The process of making an enterocoel.
Ec[000000]f[16]LBenunciatingB
Uttering articulate sounds.
Ec[000000]f[16]LBenzymeB
Proteins in cells that accelerate or stimulate chemical reactions or processes within the organism; for example, in humans, certain enzymes aid in digestion.
Ec[000000]f[16]LBephemeralB
Short lived.
Ec[000000]f[16]LBequatorialB
Relating to the conditions existing at the equator; located at the equator.
Ec[000000]f[16]LBequineB
Pertaining to horses.
Ec[000000]f[16]LBethologistB
One who studies animal behavior.
Ec[000000]f[16]LBeucalyptusB
Tall trees native to Australia with aromatic leaves and valuable wood.
Ec[000000]f[16]LBeukaryoticB
A cell or cells with visible nuclei.
Ec[000000]f[16]LBevolutionB
The gradual development of a species from primitive to advanced states.
Ec[000000]f[16]LBexcavateB
To dig, hollow out, or remove.
Ec[000000]f[16]LBexcrementB
Waste matter from the body.
Ec[000000]f[16]LBexcreteB
To expel waste from the body.
Ec[000000]f[16]LBexcretionB
The process of eliminating waste matter from the body; waste matter that is eliminated from the body.
Ec[000000]f[16]LBexcursionB
Going out or forth.
Ec[000000]f[16]LBexpectancyB
An expected amount, especially in terms of life expectancy, or the number of years of a life.
Ec[000000]f[16]LBexterminateB
To wipe out or kill off.
Ec[000000]f[16]LBextinctB
No longer in existence; having no living descendant.
Ec[000000]f[16]LBexudeB
To ooze forth or give off.
Ec[000000]f[16]LBfaunaB
Animal life.
Ec[000000]f[16]LBfelidB
Feline, or of the cat family.
Ec[000000]f[16]LBfibrousB
Tough; sinewy.
Ec[000000]f[16]LBfilamentB
Thin, flexible, threadlike part.
Ec[000000]f[16]LBflukeB
Lobe of a whale's tail.
Ec[000000]f[16]LBforageB
Food for domestic animals, or to wander in search of food; to graze.
Ec[000000]f[16]LBforegutB
Anterior of the alimentary canal.
Ec[000000]f[16]LBfrequencyB
Number of sound waves produced per second.
Ec[000000]f[16]LBfrugivorousB
Fruit eating.
Ec[000000]f[16]LBfusionB
The union of two things, as if by melting.
Ec[000000]f[16]LBgall bladderB
A small sac, under the right lobe of the liver, that stores bile.
Ec[000000]f[16]LBgenealogicB
Pertaining to the genealogy, or line of descent, of an individual.
Ec[000000]f[16]LBgeneraB
Taxonomic classes marked by common characteristics and subdivided into species.
Ec[000000]f[16]LBgenetic heritageB
Characteristics passed down to an individual through their genes.
Ec[000000]f[16]LBgenetic poolB
Total number of genes from which those of an individual are selected.
Ec[000000]f[16]LBgestationB
Pregnancy.
Ec[000000]f[16]LBgonadsB
The primary sex glands of an individual. In the male, they are the testes; in the female, the ovaries.
Ec[000000]f[16]LBgregariousB
Tending to associate with others; sociable.
Ec[000000]f[16]LBgrubsB
Wormlike larvae of some insects.
Ec[000000]f[16]LBhabitatB
Place where a plant or animal normally lives and grows.
Ec[000000]f[16]LBhemoglobinB
The pigment in red blood cells that carries oxygen to the tissues of the body and carbon dioxide away from them.
Ec[000000]f[16]LBherbaceousB
Having little or no woody tissue; leafy.
Ec[000000]f[16]LBherbivoresB
Animals, such as cows and deer, that feed mainly of plants.
Ec[000000]f[16]LBherbivorousB
Plant eating.
Ec[000000]f[16]LBheteronomousB
Subject to different laws of growth; differentiated or specialized, as in organs.
Ec[000000]f[16]LBheterotrophicB
Obtaining energy from organic compounds.
Ec[000000]f[16]LBheterotrophicallyB
As a consumer, rather than a producer.
Ec[000000]f[16]LBhibernateB
To be dormant or inactive in winter; for example, bears. Ec[000000]f[16]LBhierarchiesB
Groups organized in ranks.
Ec[000000]f[16]LBhindbrainB
Posterior segment of the brain.
Ec[000000]f[16]LBhindquarterB
Back leg of a quadruped.
Ec[000000]f[16]LBhomoiothermicB
Warmblooded, or able to regulate one's temperature internally.
Ec[000000]f[16]LBhomologousB
Similar in structure and origin, but not in function.
Ec[000000]f[16]LBhorny sheathB
An enveloping tubular structure made of horn or similar material.
Ec[000000]f[16]LBhydrologicB
Relating to the study of the effects of water on the earth's surface.
Ec[000000]f[16]LBhydrostaticB
Pertaining to the branch of physics that deals with the pressure and equilibrium of liquids.
Ec[000000]f[16]LBhypodermisB
Layer of tissue lying beneath and secreting the cuticle.
Ec[000000]f[16]LBhypothalamusB
Region of the brain beneath the thalamus that controls hunger, thirst, and the production of hormones that affect the pituitary gland.
Ec[000000]f[16]LBimmunityB
Ability to resist a particular disease.
Ec[000000]f[16]LBimpactedB
To be wedged between the jawbone and another tooth.
Ec[000000]f[16]LBimperviousB
Unable to be penetrated.
Ec[000000]f[16]LBincisorB
Tooth adapted for cutting, one of the front teeth in mammals.
Ec[000000]f[16]LBinclementB
Physically severe or harsh.
Ec[000000]f[16]LBinconspicuousB
Unnoticeable.
Ec[000000]f[16]LBincubateB
To warm and hatch eggs.
Ec[000000]f[16]LBindeterminableB
Incapable of being definitely decided.
Ec[000000]f[16]LBinextricablyB
Incapable of being untangled.
Ec[000000]f[16]LBingestionB
Act of taking in for digestion.
Ec[000000]f[16]LBinhospitableB
Providing no shelter or sustenance.
Ec[000000]f[16]LBinnervationB
Nerve supply to an organ or part of the body.
Ec[000000]f[16]LBinorganicB
Neither plant nor animal.
Ec[000000]f[16]LBinquisitiveB
Inclined to investigate or examine; curious.
Ec[000000]f[16]LBinsectivoreB
Insect-eater.
Ec[000000]f[16]LBinsomniacB
One who suffers from inability to sleep.
Ec[000000]f[16]LBinsulationB
Material, such as blubber on a whale, that prevents the transfer of electricity, heat, or sound.
Ec[000000]f[16]LBintergroupB
Between usually separate groups.
Ec[000000]f[16]LBintraspecificB
Within a particular species.
Ec[000000]f[16]LBintricateB
Complex or complicated.
Ec[000000]f[16]LBinvertebrateB
Animal, such as a worm or insect, that does not have a backbone.
Ec[000000]f[16]LBkeratinizeB
To convert into keratin, a stiff, fibrous protein that makes up hair, nails, and horns.
Ec[000000]f[16]LBkeratinousB
Pertaining to keratin.
Ec[000000]f[16]LBkrillB
Planktonic crustaceans that are the principal food of baleen whales.
Ec[000000]f[16]LBlabyrinthodontB
Primitive, extinct group of amphibians.
Ec[000000]f[16]LBlagomorphB
Herbivorous, placental, rodentlike mammals, including hares, rabbits, and pikas.
Ec[000000]f[16]LBlagoonB
Shallow channel connected to a larger body of water.
Ec[000000]f[16]LBlarvaeB
Immature forms of any animal, such as insects, that change structurally when they mature.
Ec[000000]f[16]LBlateralB
At the side.
Ec[000000]f[16]LBlineageB
Descent from a common ancestor; derivation.
Ec[000000]f[16]LBlocomotionB
Ability to move on one's own; independent movement.
Ec[000000]f[16]LBlongevityB
Duration of an individual's life.
Ec[000000]f[16]LBlumberingB
Walking with heavy clumsiness.
Ec[000000]f[16]LBluxuriousB
Magnificent or excessive.
Ec[000000]f[16]LBmammary glandB
Milk-producing gland; breast.
Ec[000000]f[16]LBmaneuverableB
Able to move or be moved at will.
Ec[000000]f[16]LBmangroveB
Tropical evergreen trees with stiltlike roots and stems.
Ec[000000]f[16]LBmanipulateB
To operate, manage, or utilize.
Ec[000000]f[16]LBmarsupialB
Furry animal with a pouch in which its young develop; for example, kangaroos.
Ec[000000]f[16]LBmedulla oblongataB
Posterior portion of the brain, continuous with the spinal cord. It controls breathing and other involuntary body functions.
Ec[000000]f[16]LBmembraneB
Thin, pliable layer of plant or animal tissue that covers, separates, or connects some part of an organism.
Ec[000000]f[16]LBmesencephalonB
Midbrain of an embryo.
Ec[000000]f[16]LBmesenchymeB
Tissue found between the ectoderm and endoderm of an embryo.
Ec[000000]f[16]LBmesenteriesB
Peritoneal folds that hold the viscera in place.
Ec[000000]f[16]LBmesodermB
Layer between ectoderm and endoderm.
Ec[000000]f[16]LBmetabolic rateB
The speed at which the body's processes occur. Varies among individuals.
Ec[000000]f[16]LBmidbrainB
Middle division of the brain; mesencephalon.
Ec[000000]f[16]LBmimosaB
An Asian tree with heads of pinkish flowers that is noted for its animal-like reactions.
Ec[000000]f[16]LBmobB
To crowd together in order to attack or annoy.
Ec[000000]f[16]LBmolarB
Tooth adapted for grinding.
Ec[000000]f[16]LBmonogamousB
Describes individuals who have only one mate.
Ec[000000]f[16]LBmonotremeB
Primitive mammal that lays eggs and has a single opening for the digestive and urinary organs; for example, the platypus.
Ec[000000]f[16]LBmontaneB
Relating to or living in mountainous regions.
Ec[000000]f[16]LBmorphologicalB
Pertaining to form or shape.
Ec[000000]f[16]LBmudflatsB
Flat areas dominated by mud.
Ec[000000]f[16]LBmultisensorialB
Serving many senses.
Ec[000000]f[16]LBmurrinaB
Cattle disease spread by bats.
Ec[000000]f[16]LBmusk glandB
A gland containing a greasy secretion with a powerful odor.
Ec[000000]f[16]LBmustelidsB
Animals that belong to the family Mustelidae and have musk glands; for example, weasels and minks.
Ec[000000]f[16]LBmuzzleB
The jaws and nose of an animal.
Ec[000000]f[16]LBnavigateB
To follow a course, especially through water or air.
Ec[000000]f[16]LBneuronB
Specialized, impulse-conducting nerve cell.
Ec[000000]f[16]LBneurosecretoryB
Pertaining to secretions of nerve cells.
Ec[000000]f[16]LBnicheB
Ecological role of an organism in its environment.
Ec[000000]f[16]LBnocturnalB
Pertaining to night or plants and animals that are active at night. Opposite of diurnal.
Ec[000000]f[16]LBnomadB
One who wanders in search of food and water.
Ec[000000]f[16]LBnomenclatureB
Name or designation.
Ec[000000]f[16]LBnonretractileB
Unable to be drawn inwards; for example, some animals have nonretractile claws.
Ec[000000]f[16]LBnotochordB
Primitive backbone.
Ec[000000]f[16]LBodontoceteB
Toothed whale.
Ec[000000]f[16]LBomnivoreB
Animal that eats both plants and animals.
Ec[000000]f[16]LBomnivorousB
Able to ingest both plants and animals.
Ec[000000]f[16]LBontogenyB
Development and growth of an individual.
Ec[000000]f[16]LBopposableB
Capable of being placed against other remaining digits; for example, the thumbs of humans are opposable.
Ec[000000]f[16]LBossificationB
The process by which bones are formed.
Ec[000000]f[16]LBovariesB
Female reproductive glands that contain ova. Ec[000000]f[16]LBpair bondB
Association formed between a mated couple.
Ec[000000]f[16]LBparasiticB
Describes a relationship between two organisms in which one organism feeds off and survives from another, harming the host organism. Ec[000000]f[16]LBpecking orderB
Social hierarchy, ranging from most aggressive to most submissive; common among birds, especially hens.
Ec[000000]f[16]LBpelageB
Hair, fur, or wool of mammals.
Ec[000000]f[16]LBpelagicB
Pertaining to middle and surface levels of the sea or ocean.
Ec[000000]f[16]LBpelvisB
Basin-shaped cavity formed by pelvic girdle and adjoining bones.
Ec[000000]f[16]LBpenchantB
Inclination.
Ec[000000]f[16]LBpendulousB
Overhanging.
Ec[000000]f[16]LBperceptionB
Observation.
Ec[000000]f[16]LBperforationB
Pore or opening.
Ec[000000]f[16]LBpericardialB
Surrounding the heart.
Ec[000000]f[16]LBperipheralB
Near the circumference; external.
Ec[000000]f[16]LBperitoneumB
Abdominal membrane that contains the viscera.
Ec[000000]f[16]LBperpendicularB
At a right angle or extremely steep.
Ec[000000]f[16]LBpharyngealB
Pertaining to the gullet.
Ec[000000]f[16]LBphylaB
Large taxonomic divisions between kingdom and class.
Ec[000000]f[16]LBphylogeneticB
Pertaining to evolution or lines of descent.
Ec[000000]f[16]LBphysiologyB
Function and activity of an organism.
Ec[000000]f[16]LBpinnipedB
Aquatic mammal whose four limbs are flippers; for example, a sea lion or walrus.
Ec[000000]f[16]LBpinnipodB
Having limbs modified into flippers.
Ec[000000]f[16]LBpituitary glandB
Master endocrine gland at the base of the brain that secretes hormones that affect growth, stimulate other organs, and regulate many bodily functions. Ec[000000]f[16]LBplacidB
Calm and complacent.
Ec[000000]f[16]LBplantigradeB
Describes animals, such as raccoons and humans, that walk with the entire sole of their foot touching the ground.
Ec[000000]f[16]LBpleuraB
Membrane in mammals that covers the lungs and makes a lining for the chest.
Ec[000000]f[16]LBpleuralB
Pertaining to the membranes that covers the lungs and lines each half of the thorax.
Ec[000000]f[16]LBpneumoniaB
Inflammation of the lungs caused by viruses, bacteria, and other microorganisms.
Ec[000000]f[16]LBpoachB
To illegally hunt.
Ec[000000]f[16]LBpolygamousB
Describes individuals who mate with more than one member of the opposite sex.
Ec[000000]f[16]LBpostanalB
Behind the anus.
Ec[000000]f[16]LBprecocialB
Born well-developed and requiring little rearing; for example, many ducks.
Ec[000000]f[16]LBprecociousB
Describes an individual who develops or matures early.
Ec[000000]f[16]LBprecursorB
Something that precedes something else. Ec[000000]f[16]LBpredationB
Action of hunting and killing for food.
Ec[000000]f[16]LBpredatorB
Animal, such as a lion, that hunts and kills other animals for food.
Ec[000000]f[16]LBprehensileB
Adapted for holding; for example, some monkeys have prehensile tails that allow them to grasp tree limbs and swing. Ec[000000]f[16]LBprimatesB
Mostly arboreal, placental mammals with limbs adapted to climbing, leaping, and brachiating; for example, monkeys and lemurs.
Ec[000000]f[16]LBproboscidsB
Placental mammals with massive skeletons and tusks; for example, elephants.
Ec[000000]f[16]LBproboscisB
A long, flexible snout or trunk.
Ec[000000]f[16]LBprocurementB
The act of getting possession.
Ec[000000]f[16]LBprodigiousB
Exciting or amazing.
Ec[000000]f[16]LBprogenyB
Descendants or offspring.
Ec[000000]f[16]LBprolificB
Producing abundant offspring.
Ec[000000]f[16]LBpropensityB
Natural inclination or tendency.
Ec[000000]f[16]LBpropulsiveB
Pertaining to swift forward motion or drives. Ec[000000]f[16]LBprosimianB
Member of the suborder of primates including lemurs, lorises, and tarsiers.
Ec[000000]f[16]LBprotochordateB
Animal having gill slits, a notochord, a central nervous system, and postanal tail.
Ec[000000]f[16]LBprotosomeB
Anterior part of body.
Ec[000000]f[16]LBprotozoanB
Microscopic, eukaryotic, single-celled animal that reproduces by fission; for example, amebas.
Ec[000000]f[16]LBprotrudingB
Thrusting forward.
Ec[000000]f[16]LBprotuberanceB
Condition of protruding; something that protrudes.
Ec[000000]f[16]LBproverbialB
Describes something that is well known because it is frequently referred to.
Ec[000000]f[16]LBpseudocoelB
Space between the mesodermal tissue and gastrodermis in some primitive animals.
Ec[000000]f[16]LBpseudopodiaB
Temporary footlike protrusions in some organisms.
Ec[000000]f[16]LBpugnaciousB
Belligerent.
Ec[000000]f[16]LBpulverizeB
To reduce to dust.
Ec[000000]f[16]LBquillB
A sharp, hollow spine, usually on a porcupine or hedgehog.
Ec[000000]f[16]LBrabiesB
Fatal viral disease that affects the central nervous system; usually transmitted through dog bites.
Ec[000000]f[16]LBradial symmetryB
Describes organisms whose body parts are arranged state of having body parts arranged around an axis; for example, a starfish.
Ec[000000]f[16]LBrecurveB
To bend backward.
Ec[000000]f[16]LBregurgitateB
To bring back up partially digested food from the stomach to the mouth. Ec[000000]f[16]LBretractileB
Able to be drawn inward; for example, some animals have retractile claws.
Ec[000000]f[16]LBringed hornB
A horn that is surrounded or encircled, usually by tissue or pigmentation.
Ec[000000]f[16]LBritualB
Formal, repeated act or series of acts; for example, some animals perform mating rituals every year.
Ec[000000]f[16]LBrobustB
Hardy, vigorous.
Ec[000000]f[16]LBrodB
Retinal receptor responsive that helps the eye adjust to faint light.
Ec[000000]f[16]LBrudimentaryB
Imperfectly developed.
Ec[000000]f[16]LBruminantB
An animal that chews its cud; for example, a cow.
Ec[000000]f[16]LBsaprophyteB
Any fungus or bacteria that feeds on dead and decaying matter.
Ec[000000]f[16]LBsavannaB
Tropical or subtropical grassland characterized by scattered trees and seasonal rains.
Ec[000000]f[16]LBscavengeB
To feed on carrion or refuse.
Ec[000000]f[16]LBscavengerB
An animal that eats carrion or refuse.
Ec[000000]f[16]LBschizocoelB
Coelom formed by splitting mesoblastic tissue.
Ec[000000]f[16]LBsecreteB
To form and give off; for example many glands of the human body secrete substances.
Ec[000000]f[16]LBsemiaquaticB
Frequenting, but not totally dependent on water.
Ec[000000]f[16]LBsexual dimorphismB
Describes species in which males and females have two distinct forms.
Ec[000000]f[16]LBsocial instinctB
A powerful motivation relating to the community or social group.
Ec[000000]f[16]LBsonarB
System of sound wave transmission that enables some animals, such as dolphins, to detect the location of an object.
Ec[000000]f[16]LBspecializeB
To adapt to a particular habitat, food source, or mode of life.
Ec[000000]f[16]LBspeciesB
The fundamental group in taxonomy, below genus, whose members can interbreed only with each other.
Ec[000000]f[16]LBspecimenB
An individual that is representative of the whole group.
Ec[000000]f[16]LBspiculeB
A very small, needlelike body or projection.
Ec[000000]f[16]LBsplanchnicB
Pertaining to the viscera or entrails.
Ec[000000]f[16]LBsprinterB
High speed, short distance runner; for example, a cheetah.
Ec[000000]f[16]LBspurB
Process or outgrowth; spine.
Ec[000000]f[16]LBsubcutaneousB
Located beneath the skin.
Ec[000000]f[16]LBsubmaxillaryB
Beneath the lower jaw.
Ec[000000]f[16]LBsuidB
Pigs and hogs.
Ec[000000]f[16]LBsuperficialB
Obvious or readily apparent; external.
Ec[000000]f[16]LBtaxaB
Taxonomic categories; plural form of taxon.
Ec[000000]f[16]LBtaxonimistB
One who classifies plants and animals.
Ec[000000]f[16]LBtaxonomicB
Pertaining to classification of organic life.
Ec[000000]f[16]LBterrestrialB
Pertaining to or dependent on land.
Ec[000000]f[16]LBtestesB
Male reproductive glands.
Ec[000000]f[16]LBthoracicB
Of or near the thorax. Ec[000000]f[16]LBthoraxB
Part of body between the neck and abdomen.
Ec[000000]f[16]LBtimberB
Growing trees.
Ec[000000]f[16]LBtracheaB
Air passageway to the lungs.
Ec[000000]f[16]LBtrachioleB
Respiratory air tube.
Ec[000000]f[16]LBtransitionB
Change from one mode to another.
Ec[000000]f[16]LBtrichinosisB
A disease caused by eating undercooked meat, usually pork.
Ec[000000]f[16]LBtrinomialB
Having three names: genus, species, and subspecies or variety.
Ec[000000]f[16]LBtularemiaB
Infectious disease that mainly affects rodents but that can be spread to humans as well.
Ec[000000]f[16]LBtundraB
Area between the tree line and the ice cap with permanently frozen subsoil where low growing plants are found.
Ec[000000]f[16]LBtunicateB
Primitive marine chordate with thick covering.
Ec[000000]f[16]LBturgidityB
Swelling or bloating.
Ec[000000]f[16]LBtuskB
An elongated and pointed tooth that extends outside the mouth.
Ec[000000]f[16]LBtyphusB
any of several infectious diseases that are spread by lice, mites, and fleas.
Ec[000000]f[16]LBtypologicB
Relating to classification based on type.
Ec[000000]f[16]LBubiquitousB
Omnipresent; everywhere.
Ec[000000]f[16]LBultrasonicB
Describes a sound wave that is above range of human hearing.
Ec[000000]f[16]LBunambiguousB
Precise; easily discernible.
Ec[000000]f[16]LBundercoatB
Short hair or fur concealed by longer growth.
Ec[000000]f[16]LBundulationB
The action of rising and falling in waves.
Ec[000000]f[16]LBungulateB
Having hooves; belonging to the group of mammals that have hooves.
Ec[000000]f[16]LBunicelledB
One-celled.
Ec[000000]f[16]LBureterB
Duct that carries urine from the kidney to the bladder.
Ec[000000]f[16]LButerusB
Hollow, muscular organ in the pelvic area of female mammals where the embryo develops.
Ec[000000]f[16]LBventralB
Pertaining to the abdominal surface.
Ec[000000]f[16]LBvestigeB
Degenerate or imperfectly developed organ or part.
Ec[000000]f[16]LBviableB
Capable of growing or developing in favorable conditions.
Ec[000000]f[16]LBvibrissaB
Hair or bristle on the upper lip or head of some mammals that acts as a tactile organ; for example, whiskers on a mouse.
Ec[000000]f[16]LBvicunasB
A llama-like ruminant with fine, silky fleece.
Ec[000000]f[16]LBvisceraB
Internal organs.
Ec[000000]f[16]LBviviparousB
Describes animals that bear live young, for example, most mammals. Ec[000000]f[16]LBvoluminousB
