As air moves away from the tropics and toward the poles, it becomes
a.) cool and dry
b.) cool and moist
c.) warm and dry
d.) warm and moist

Explanation:

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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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