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The primary difference between estrous and menstrual cycles is that ____. A) in the absence of pregnancy, the endometrium is reabsorbed in estrous and shed in menstrual cyclesB) behavioral changed during estrous cycles are much less apparent than those of menstrual cyclesC) season and climate have less pronounced effects on estrous cycles than they do on menstrual cyclesD) copulation normally occurs throughout the estrous cycle, whereas in menstrual cycles copulation only occurs during the period surrounding ovulation

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