This fast. But given enough time life could evolve using other things than carbon, carbon is just way faster than anything else and would likely crowd out other contenders. But if for some reason a place is very low on carbon there is a chance for other chemistries to dominate even if their pathways are much slower than the ones in a carbon based environment.
It used to be that the thinking was that this was simply unlikely to the point of being impossible but since 2017 there has been some change in attitude towards especially the possibility of silicon based life.
It used to be that the thinking was that this was simply unlikely to the point of being impossible but since 2017 there has been some change in attitude towards especially the possibility of silicon based life.