How do tadpoles and birds develop and get born without a placenta?

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asked Oct 6, 2016 37.8k views

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How do tadpoles and birds develop and get born without a placenta?

Biology
middle-school

Rurouni asked

by Rurouni

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They develop by feeding from the yolk of the egg that the frog has laid and that is equal to a placenta.

Keul answered Oct 12, 2016

by Keul

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