What drives diversity? Natural Selection is a force and results in .

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

What noticeable trend from this graph might be used to make a conclusion?

Which factor is difficult to assess in a cost-benefit analysis