A Flatworms form a 3rd germ ^layer, which coelenterates ^do not, called the ________. ^A) Mesoderm B) Endoderm ^A Planarians are _______. ^A) Scavengers B) Parasites ^ ^ ^B A good example of bilateral ^symmetry is the _______. ^A) Sponge B) Planarian ^ ^A Cephalization refers to the ^concentration of receptors ^at the ______ end. ^A) Anterior B) Posterior ^A An animal that has male ^and female sex organs in ^its body is a ^A) Hermaphrodite B) Host ^B The crop and gizzard are ^parts of the digestive tract ^of ______. ^A) Planaria B) Earthworms ^A The earthworm has a closed ^circulatory system. ^A) True B) False ^ ^B The ______ removes waste in ^earthworms as nephrons remove ^waste in humans. ^A) Nephridia B) Flame Cells ^A A cavity containing digestive ^organs is the _______. ^A) Coelom B) Colon ^ ^B A ----- is a thick non-living ^layer secreted by the ^epidermis. ^A) Secretion B) Cuticle ^
