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Repeated evolution of placenta: at least 100 independent origins across the animal kingdom

First off, let me start with some quotes from mainstream-articles:

The placenta is arguably the most important organ of the body, but paradoxically the most poorly understood

The placenta: a mysterious organ

Despite being critical to a baby’s survival, the placenta remains something of a medical mystery. Detailed understanding about how it carries out all its functions is lacking. Even less is known about what has gone awry with those functions when a pregnancy is lost.

It is a complex and highly structured organ with rich vascular contributions from two entities, mother and fetus. It is the only human organ than can be grown as new, discarded, then de novo grown again

let me repeat the last one: “It is a complex and highly structured organ with rich vascular contributions from two entities, mother and fetus. ”

and now lets see who believes in miracles:

According to evolutionary biologists, the placenta evolved many times repeatedly, at least 100 independent origins across the animal kingdom …

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