Which of these describes a population?

a.
all the organisms that interact in a lake

b.
all the gray squirrels that live in a forest

c.
an area characterized by a group of plants and animals

d.

a nonliving factor in an organism’s environment

i dont know this but ask your teacher for !

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.

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