The double circulation of tetrapods consists of a circulation serving the body and a circulation serving the lungs.
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Q15: Viviparity is common among the caecilians.
Q16: The Caudata
A)are hermaphroditic.
B)have a tadpole stage.
C)retain their
Q17: Caecilians
A)live in the tropics.
B)are blind or nearly
Q18: _ are carnivorous in both the adult
Q19: The tetrapods originated in the Devonian period
Q21: Frogs typically lay eggs in water,but some
Q23: Most familiar North American salamanders (family Plethodontidae)lack
Q24: Some salamanders (such as the mud puppy
Q25: The frog heart has two atria and
Q38: Frogs and toads belong to the order
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