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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.

i hope this : )

a covalent bond, specfically triple bond

it's diluted or concentrated

in a diluted solution, you can add a lot more solute but in concentrated only a little more can be added