What is osmosis?

A. The process in which molecules cannot directly diffuse across the membrane
b. The special channels in the cell membrane that allow facilitated diffusion to take place
c. The diffusion of water through a selectively permeable membrane.
d. The process in which phospholipid bilayers form

C. The diffusion of water through a selectively permeable membrane.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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