Sympatric speciation occurs due to all of the following except O geographic isolation O pre-zygotic isolation O post-zygotic isolation O behavioral isolation​

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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c is the correct answer!