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Whales, dolphins, and porpoises are marine ____.
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amphibians
|
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Non-avian ____ roamed the Earth for about 165 million years.
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birds
|
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Unlike amphibians and reptiles, all mammals have ____.
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dinosaurs
|
|
Alligators, lizards, snakes, and turtles are classified as ____.
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fish
|
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Reptiles evolved from amphibians, which evolved from ____.
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hair
|
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All ____ living today are dinosaurs.
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mammals
|
|
Most reptiles are thick-skinned and are covered with ____.
|
reptiles
|
|
Frogs, newts, salamanders, and toads are classified as ____.
|
scales
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