baseballcool855 baseballcool855

11-06-2020
Biology

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Kangaroos are mammals that lack a placenta. Therefore, they must have an alternate way of supplying the developing embryo with

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justinabettyo justinabettyo

11-06-2020

Answer: yolk sac

explanation:

the placenta does not develop for a long time so the alternate way of supplying the developing embryo is through the yolk sac which the embryo can receive nutrients and respiratory gas exchange through which the placenta will be formed later.

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rjohnson32 rjohnson32

11-06-2020

Answer:

nutrients all mammals need nutrients

Explanation:

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