For me it is the fact that our blood contains iron. I earlier used to believe the word stood for some 'organic element' since I couldn't accept we had metal flowing through our supposed carbon-based bodies, till I realized that is where the taste and smell of blood comes from.

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[โ€“] 11 points 3 years ago (1 child)

They have their own separate genetic code, yes, but that doesn't make them a separate species, because they aren't a distinct organism at all. They don't exist in the absence of our cells.

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