Which Activity would be within the field of biology A. Studying the mechanics of how ships release waste
B. Doing Research on how plastic affects the environment
C. Doing a study on how plastic bags are made

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