1. Reptiles use lungs to breathe. They have dry skin with scales and they lay eggs. They are cold- blooded. Turtles belong in this group.
2. Mammals use lungs to breathe. They are warm- blooded and they have hair or fur. They give birth to live young. Humans belong in this group.
3. Birds are warm-blooded. They have feathers. They lay eggs with hard shells. They have wings and breathe through lungs. Eagles belong in this group.
4. Amphibians are cold-blooded. Their skin is wet. The young have gills but adults have lungs. They lay their eggs in water. Frogs belong in this group.
5. Fish are cold-blooded too. They have gills and live in water. They lay their eggs in water and they have wet scales. Sardines belong in this group.
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