Describe the different categories in which a group of organisms can become isolated from one another. Give an example of each category.(NO LINKS) DUE TODAY PLEASE HELP

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

When listening the levels of orginization in orginisims from the smallest to most complex , which level is just below organs in complexity

How did alexander fleming’s research solve a societal problem? he developed ways to treat inherited diseases. he advocated for regular hand washing to kill germs. he discovered a new type of medicine that could treat infections. he discovered the cause of mad cow disease, an emerging disease.