Define the carrier of a trait in terms of alleles

This is a type pf behavior that animals are born with and them to survive

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

Describe the function of the endomembrane system? what organelles are involved?