Which of the following is a true statement?
a. estrous cycles are more frequent than menstrual cycles.
b. estrous cycles are not controlled by hormones.
c. all mammals have menstrual cycles.
d. the endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles.
e. ovulation occurs before the endometrium thickens in estrous cycles.

A) The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles.

Explanation:

The endometrium can be defined as the inner layer of the epithelium. It along with the mucous membrane forms the covering of the mammalian uterus. It is the basal and functional layer of the uterus. This layer thickens and then shed during the menstruation cycle in humans and in some other mammals including the apes, monkeys, bats and elephants. But the endometrium layer is reabsorbed in the estrous cycle.

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