Cells responsible for innate immunity are activated most commonly by… A. glucocorticoids. B. epitopes on antigens. C. cytoplasmic proteins of bacteria. D. antigen presentation via MHC proteins. E. carbohydrate sequences in bacterial cell walls.

The answer is C. cytoplasmic proteins of bacteria

Explanation:

The immune system includes innate immune responses and adaptive immune responses.

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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