Which statement explains endosymbiosis theory?

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 is the name of the type of cell division that occurs in the prokaryotic cell cycle

Individuals do not compete directly for resources, but are prey for the same predator