Problem:
Females of most mammalian species have estrus cycles instead of menstrual cycles. Such females usually come into estrus (also called in heat) only once a year. This single estrus period is the only time mature, fertilizable eggs are present in the ovaries. Human and a few other primate females, however, exhibit many menstrual cycles per year where fertilizable eggs are present in the ovaries during each cycle.
Required:
Question: Discuss possible adaptive advantages to each of these two strategies of reproduction.
Give reasoning with your answer.