These fossils can be best used to provide information that could be used in a study of

years ago fossils from animals who lived on the earth before humans came on earth.

Explanation: like the dinosaurs used too lived on the earth before humans came along.

youre right there are

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 : )