The major classes of vertebrates have developed Innovations that distinguish each group. Birds and mammals are both_____that Is they are able to maintain their Internal body temperature at a fairly constant level. Birds are the only animal group on earth with_____and hollow bones adapted for flight Mammals have evolved mammary glands, hair; and______development of young. endothermic; feathers, internal ectothermic. claws, internal homeothermic, wings, external endothermic. claws, internal ectothermic; feathers, external
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Question: The major classes of vertebrates have developed Innovations that distinguish each group. Birds an…
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