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the claim
Menstruation evolved to protect the uterus from invasive embryos
the verdict
SUPPORTED
the evidence backs this
confidence 75/100

Menstruation and spontaneous decidualization are understood in evolutionary biology as adaptations that protect the maternal organism from excessively invasive embryos.

Evidence for · 2
The significance and evolution of menstruation.
2018 · cited by 0
States that spontaneous decidualization and menstruation serve as a mechanism to protect the mother from invasive characteristics of the embryo.
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More for · 1
Why do women menstruate? Historical and evolutionary review.
1996 · cited by 0
Explains that menstruation is the shedding of decidualized stroma that evolved in response to highly invasive blastocysts.
The paper trail · every fact has a biography
first checked01 Aug 2026
judged → SUPPORTED · 7501 Aug 2026
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