77 points
if mutation caused there to be some humans that could fly, what might happen? a)it might take thousands or millions of years, but the ability to fly might increase in the population, since it would probably be adaptive.
b) the new gene would quickly be eliminated in the species.
c) all humans would be able to fly shortly after.
d) none of the above are true.

bacteria could be both, harmful and to us. harmful bacteria could make us sick and probably even by getting the chances of getting a disease, but good bacteria fight it off with your immune system. there is always bacteria everywhere we go. we need to make sure to wash our hands after using the restroom, before eating, after eating, after petting an animal too. so you see, bacteria is everywhere and is harmful or . i hope this . : ) : ) : )