mammals - hair or fur, warm-blooded, live births, lungs, birds - feathers, warm-blooded, lay eggs, lungs, fish - scales, live in water, cold-blooded, lay eggs, gills, amphibians - smooth skin, live in the water and on the land, cold-blooded, lay eggs, reptiles - scales or shell, cold-blooded, lay eggs, insects - six and more legs, 3 parts of body, lay lots of eggs,

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