I guess it makes sense, but I've never thought of it like that before.

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[–] 7 points 5 months ago

we also have cartilege inside us where blood vessels previously had bypasses, as blood kinda flows in reverse when the umbilical system is active.

It's kind of insane, infants switch their whole circulatory system around at birth. Looking at it you'd think it's a horribly fragile system but clearly it's extremely reliable!

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