Me what is the main function of the circulatory system? a. to deliver oxygen and nutrients to cells throughout the body b. to provide all major organs with carbon dioxide c. to remove waste from the body d. to digest food

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explanation:

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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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