Plant or animal which supports a parasite

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

Which of the following is required of a new drug?me

Which type of landforms forms at the plate boundary as a result of divergent stress