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Author Question: In placental mammals, the yolk sac A) transfers nutrients from the yolk to the e (Read 635 times)

sammy

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on: Oct 2, 2013
In placental mammals, the yolk sac
A) transfers nutrients from the yolk to the embryo.
B) differentiates into the placenta.
C) becomes a fluid-filled sac that surrounds and protects the embryo.
D) produces blood cells that then migrate into the embryo.
E) stores waste products from the embryo until the placenta develops.


clippers!

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Reply #1 on: Oct 6, 2013
For sure it has to be D Mark as solved once you're done!


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