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Repeated evolution: Placenta evolved repeatedly, more than 100 times!

Be careful, considering the complexity of placenta, the following may be very strong stuff for some of you …

Placental structures have evolved to support pregnancy in most organisms that give birth to live young, totaling more than 100 independent origins across the animal kingdom.

https://phys.org/news/2017-03-placenta-complex-evolve.html