B The study of the relation of ^living things to their ^environment is: ^A) Biosphere B) Ecology ^A Temperature, altitude, water ^and light are _____ factors ^that affect living things. ^A) Abiotic B) Biotic ^A What do we call the thin ^layer where life exists on ^earth? ^A) Biosphere B) Biome ^A A food chain refers to the ^transfer of energy from one ^living thing to another. ^A) True B) False ^B The basic life processes ^involved in the carbon-oxygen ^cycle are respiration and: ^A) Excretion B) Photosynthesis^A Green plants form protein ^by first absorbing _____ from ^soil through their roots. ^A) Nitrates B) Oxygen ^B _____ is the oxidation of ^nitrites to form nitrates. ^A) Ammonia B) Nitrification ^ ^A Herbivores obtain their ^protein from autotrophic ^organisms. ^A) True B) False ^A In the nitrogen cycle, nitro- ^gen-fixing bacteria produce ^nitrates in _____ nodules. ^A) Root B) Leaf ^B The loss of water from the ^oceans and land into the ^atmosphere is called: ^A) Precipitation B)Evaporation^
