Compare and contrast a Keystone Species with a Keystone Predator

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A keystone species is one that has a disproportionate impact on its ecosystem when compared to its abundance. A foundation species is usually a primary producer that dominates an ecosystem in abundance and influence.

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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the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.