What is the temperate and enzyme activity independent and dependent variable?

Biology 1c cumulative exam i need awsners

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

9. the history of life on earth is recorded in