Amass extinction is defined as
a loss of 95 percent of species
an asteroid impact
a boundary between geological periods
a loss of 50 percent of species

95% of species

Explanation:

the word mass, means very large and widespread.

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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