According to what we've learnt :
- we can approximate the number of generations since the first human pretty much like us (depending what / who we talk about).
- we have an idea of the series of life forms we come from.
So is it possible to give it a very rough number ? Or it's not, because of some issues - but which ones ? (I only think about the many, short generations of the first forms, which moreover we don't really know about, as a limit to counting)
What if we stop counting at "unicellular" (or else) ?
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