Populations of dinoflagellates are being affected by global climate change, causing concerns about increased red tides and coral bleaching. On the other hand, a related group of protists, the diatoms, play an important role to slow global warming by

Sequestering carbon from the atmosphere to the ocean floor.

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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