Is there life on other planets? Are we the only intelligent beings in the universe? What is the reason for your opinion?

there must be if there is none how could we be so intelligent ourselves

yes? sounds right, but you didn’t ask a question.

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.

i hope this : )