Teorías que afirmaban que lo seres vivos han cambiado constantemente y el cambio es la causa de la gran diversidad de la flora y la fauna en la tierra

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 : )