|
Title: In placental mammals, the yolk sac Post by: ppk on May 23, 2011 In placental mammals, the yolk sac
A) differentiates into the placenta. B) transfers nutrients from the yolk to the embryo. 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. Title: Re: In placental mammals, the yolk sac Post by: biolove on May 26, 2011 d
|