The rotational period of the moon is a. always changing b. greater than the revolution period around the earth c. less than the revolution period around the earth d. equal to the revolution period around the earth

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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