Choose the correct statement regarding estrous and menstrual cycles.
A. Animals with estrous cycles are sexually receptive only when they are ovulating.
B. Menstrual cycles are longer than estrous cycles.
C. Copulation can only occur during ovulation in the menstrual cycle.
D. The lining of the uterus is shed during menstruation and estrous.
E. Ovulation only occurs in animals with a menstrual cycle.
A. Animals with estrous cycles are sexually receptive only when they are ovulating.
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