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30 November, 22:00

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

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  1. 1 December, 00:15
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    nutrients all mammals need nutrients
  2. 1 December, 01:34
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    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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