Describe two ways in which evolutions of the organisms can have a harmful effect on humans.

Building glycogen from glucose molecules is an example of what

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 structure in the cardiovascular system connect arteries to veins?