Biology

Define yolk sac.

Asked by bookragstutor on 10 Sep 01:36

Last updated by Jill W on 22 Nov 13:15

1 Answers

Answered by Jill W on 22 Nov 13:15

The yolk sac is one of four extraembryonic membranes that supports embryonic development. It is the first site of blood cells and circulatory system function.