¿Todo nacemos con células madre? ¿Por qué?

i thinking chemical change

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 : )

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully