Question

What is menstural cycle? Which animals undergo this?​

Answer 1

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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Answer 2

Answer:

It is the regular natural change that occurs in the female reproductive system that makes pregnancy possible.