What Is the Principal Difference Between Menstrual and Estrous Cycles

question 67

Multiple Choice

What is the principal difference between menstrual and estrous cycles?

• A) The estrous cycle occurs if the female becomes pregnant,whereas the menstrual cycle occurs if the female is not pregnant.
• B) The menstrual cycle occurs if the female becomes pregnant,whereas the estrous cycle occurs if the female is not pregnant.
• C) The estrous cycle lacks menstruation.
• D) The menstrual cycle occurs in mammals,whereas the estrous cycle occurs in birds.
• E) Only the menstrual cycle is controlled by estrogen.

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