Which represents the size of a population? the birth rate
number of species in an area
the death rate
number of indivduals in a species

d.

Explanation:

[character limit thing]

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 : )