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Answer:
Vertebrates
1.fish,
2. amphibians,
3.reptiles,
4 birds,
5. mammals.
Characteristics
1.Fish (including sharks) make up the largest group of vertebrates. Nearly half of all vertebrates are fish. Fish have been swimming in Earth's water for more than five hundred million years- longer than any other kind of vertebrate has been on Earth.
2.Amphibians have a backbone, are cold-blooded, need a moist place to live, can breathe air through their skin, externally fertilize their eggs, eat meat, and grow legs when they mature.
3.Reptiles are vertebrates. They have backbones.
Their bodies are completely covered with scales.
They are cold-blooded.
Reptiles produce shelled eggs or bear live young.
All species fertilize eggs internally.
All species of reptiles have at least one lung.
4.Feathers.
High metabolism.
A four-chambered heart.
A beak with no teeth.
A lightweight but strong skeleton.
Production of hard-shelled eggs.
5.Mammals have hair or fur; are warm-blooded; most are born alive; the young are fed milk produced by the mother's mammary glands; and they have a more complex brain than other animals.