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How could embryonic diapause have naturally developed in humans?

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embryonic diapause is a reproductive strategy that is used by a number of mammals. In embryonic diapause, the embryo  does not immediately implant in the uterus after sexual reproduction has created the zygote, but is maintained in a state of dormancy. Little to no development takes place while the embryo remains unattached to the uterine wall. As a result, the normal gestation period is extended for a species-specific time.

Mammals do this to time the birth of their offspring and to avoid risking their lives in unfavorable conditions. Suppose this ability was natural in humans. How could it have developed? How could it serve as an evolutionary or social advantage?

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This post was sourced from https://worldbuilding.stackexchange.com/q/121331. It is licensed under CC BY-SA 4.0.

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