The characteristic climax vegetation of which biome consists of coniferous trees

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

List two limitations of natural selection

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen