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Most mammals give birth to live young, but not all do. A few Australian marsupials, such as the duck-billed platypus and echidna, lay eggs.

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13y ago
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10y ago

Those mammals are called marsupials, there are many in Australia.

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10y ago

do mamals develop in the womb? yes

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12y ago

it is called marsupial u are very welcome

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Q: Do mammals develop in the womb?
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