Viruses are sometimes triggered into an active state by overexposure to sun, sickness or stress

True

Explanation:

True because bacteria multiplies in the heat more rapidly

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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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