Mitochondria are weird - they generate the energy in our cells but they aren't actually human. Billions of years ago they inserted themselves into our proto cells and found that we offer protection, food and warmth, we found that they generate energy for us efficiency. It's s symbiotic relationship and we have evolved together all this time. Isn't that amazing!
https://www.ruf.rice.edu/~bioslabs/studies/mitochondria/mitorigin.html
Our bodies stole from them too ...
We can grow our babies inside our bodies because we stole the dna from viruses to keep our own bodies from attacking the baby.
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