Variations of a specific gene, which code for slightly different proteins, are called

i think its c. amphipod

b because they naturally adapt to their environment plz mark brainliest

explanation:

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 : )