Why do humans have periods at all? Isn’t it a liability that evolution should have gotten rid of by now?

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#Menstruation
#Periods
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Sources:

https://eusci.org.uk/2020/04/09/why-d...
https://www.ncbi.nlm.nih.gov/pmc/arti...

Elephant Shrew and Spiny Mouse
https://www.ncbi.nlm.nih.gov/pmc/arti...
https://jme.bioscientifica.com/view/j...
https://www.sciencedirect.com/science...


Chapters:
00:00 - Intro
01:02 - Estrous Cycle
03:22 - Menstrual Cycle
07:46 - Frequency of Periods

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