Does protozoa require a host for reproduction?

yes
no

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 enzyme is most important for dna replication and why?

The body of water found at number 4 on the map above is the