If you decide to buy a purebred puppy, you would have many different dog breeds to choose from. the wide variety of dog breeds is the result of hundreds of years of
a) lna
b) genes
c) hormones
d) tradition

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 : )

the answer is c.mitochondria. glad to .