Which of the following is not part of the cell theory? Cells must contain DNA

Cells can only come from exsiting cells

all living things are made from cells

cells are the basic unit of life

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