An estrous cycle involves reabsorption of the endometrial lining if pregnancy does not occur, with females displaying heat behavior, unlike the menstrual cycle in primates.
An estrous cycle is a reproductive cycle seen in most mammals where the endometrial lining is reabsorbed if pregnancy does not occur, and the female shows behavioral changes indicating she is in heat and fertile. This type of cycle differs from the menstrual cycle seen in primates like humans and chimpanzees.
The options provided in the question can be best answered as: Outerus lining is not shed; reproduction occurs only at certain times of the year. This aligns with the description of an estrous cycle where the lining is reabsorbed, not shed, and reproduction is limited to specific periods when the female is in heat.
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