When does menstruation occur? a.) before oogenesis. b.) before ovulation. c.) after menopause is complete. d.) after an egg fails to fertilize

Option D

Explanation: The formation of eggs is known as oogenesis. The sperms of the male body fertilizes the eggs present in the female body.

When the eggs are not fertilized then the eggs along with the thin lining of the uterine wall shed in the form of bloody secretion which is known as menstruation.

This occurs only when the eggs are not fertilized by the sperm.

the animal that would be cutest if scaled down to the size of a cat? elephant