What is histology? the study of cells the study of the gross structure of the body the study of the tissues of the body the study of cell chemistry the study of energy production of the body?

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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d. organisms have cells with different shapes and functions.