Most of earth's usable chemical energy came to earth as solar energy but has been stored as a) fossil fuels. b) nuclear fuels. c) ultraviolet waves. d) geothermal energy.

A: fossil fuels I believe is the answer

A

Explanation:

Fossil fuel are energy buried within the earth that could used as energy source for consumption. Most sources of earth's energy comes from fossil fuels

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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