Astudent runs up a flight of stairs. other than the skeletal system, which body system would be most immediate in its support of the muscular system in this activity?

i would think the cardiac muscle because your blood would be pumping.

the animal that would be cutest if scaled down to the size of a cat? elephant

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 : )