i’d hazard to guess that we don’t know 99.9999999999999999999999999999% of what’s in a cell at the molecular machine level ...
“The final answer to every question is God”
that’s pretty much correct ... personally, i believe the entire contents of the Earth biosphere is a product of intelligent evolution, i.e., a group of creators not too much different than us, but a few hundreds years more advanced technologically than us, created it and us in the same step-wise fashion that our own technological culture has advanced from chipped flints to what we have today through the accretion and application of knowledge gained via our intelligence and creativity (that is, we have created in the likeness of our creators) ... perhaps our immediate creators were created likewise and so forth, but ultimately it does beg the question of first creation ...