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Q:

Do all mammals have belly buttons?

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Not all mammals have belly buttons. Placental (or eutherian) mammals have belly buttons. They nourish their fetuses by a placenta that is connected to the umbilical cord. Non-placental mammals do not have belly buttons - this group of mammals includes monotremes (metatherian mammals), which lay eggs, and marsupials (prototherian mammals), which nurture their young in a pouch. more
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