ANSWERS: 6
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No, there are a few exceptions.
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No, Platipi and echidnas are mammals and they lay eggs... They belong to a special classification of mammals called "Monotremes". Other than that, yes.
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Nope. The Platypus is a shining example. It lays eggs, yet is a mammal.
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no platypuses lay eggs and they are mammals.
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6-10-2017 That is one definition of mammals. But every definition has exceptions.
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Besides the Platypus, Echidnas and spiny anteaters also lay eggs and are mammals.
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