a cold-blooded animals found in water that has a body coveredin scales and breathes through gills
the transformation of an animal from its larval form into its adult form
an animal who is warm-blooded, that usually has hair on its body and feeds milk to its young (females)
an animal without a backbone
in mammals, the period of time spent by a developing offsprinng inside the mother's body
an animal that is small, limbless, and shaped like a snake
an animal that maintains a constan body temerature
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