Which idea was missing from Darwin's explanation of evolution?

Hello, Distinguished Professor Ross Large has uncovered the missing link in Darwin's theory of evolution. That link is the trace element selenium. His research has found that selenium correlates to nearly every major extinction and growth event in Earth's 4.5 billion year history.Nov 4, 2015

Explanation: Quick joke  Question: Why is wind power popular?       Because it has a lot of fans!

option a and d is the correct answer

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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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