How are mammals different from egg-laying animals?
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Two major groups of the world's animals are mammals and reptiles. ... Mammals have hair all over their bodies, while reptiles have scales. Mammals have live births and produce milk for their young, while reptiles lay eggs. Reptiles have only three-chambered hearts, mammals have four.
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Two major groups of the world's animals are mammals and reptiles. ... Mammals have hair all over their bodies, while reptiles have scales. Mammals have live births and produce milk for their young, while reptiles lay eggs. Reptiles have only three-chambered hearts, mammals have four.
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