what are the 3 classes of vertebrata (tetrapods)?
amphibians, reptiles, mammals
The three classes of tetrapods, or vertebrates with four limbs, are:
1. Amphibia: This class includes animals such as frogs, toads, newts and salamanders. Amphibians typically have moist skin which they use to breathe, and they often lay their eggs in water.
2. Reptilia: This class includes animals such as snakes, turtles, lizards and crocodiles. Reptiles are cold-blooded and have scaly skin. Most reptiles lay eggs, although some species give birth to live young.
3. Aves (birds): This class includes all birds. Birds are warm-blooded and have feathers, beaks, and wings for flight. They lay hard-shelled eggs and are known for their ability to sing, migrate, and build elaborate nests.
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