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Why do women have periods?

user Retro Player
조회수 17,781
등록 2021-10-14 22:22
View full lesson: http://ed.ted.com/lessons/why-do-women-have-periodsA handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We’...
Why do women have periods?
View full lesson: http://ed.ted.com/lessons/why-do-women-have-periodsA handful of species on Earth share a seemingly mysterious trait: a menstrual cycle. We’...

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