I'm kinda late.

Stay awesome, Stay sweet and don't forget to be nice to each other

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 : )

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex