The increase in the population of people living in urban areas will cause a decrease in urban sprawi.
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explanation:

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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sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate