What is menstural cycle? Which animals undergo this?
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Most female mammals have an estrous cycle, yet only ten primate species, four bats species, the elephant shrew, and one known species of spiny mouse have a menstrual cycle. As these groups are not closely related, it is likely that four distinct evolutionary events have caused menstruation to arise.
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It is the regular natural change that occurs in the female reproductive system that makes pregnancy possible.
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