What are the five classes of vertebrates?
The five classes of vertebrates are mammals, birds, reptiles, amphibians, and fish. Mammals are warm-blooded, have hair or fur, and give birth to live young. Birds have feathers, lay eggs, and have beaks and wings. Reptiles have scales, lay eggs, and are cold-blooded. Amphibians are cold-blooded, lay eggs in water, and have permeable skin. Fish have scales, gills, and most lay eggs in water. These five classes encompass the vast diversity of vertebrate animals in the world.
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