2. which molecule most directly provides the muscle cells in an athlete with the energy
needed to run a race?
a. water
b. carbon dioxide
c. deoxyribonucleic acid
d. adenosine triphosphate

D. adenosine triphosphate

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.

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