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