Which statement describes a source of new genetic variation in a species?

B. Mutation
Because it is the only one that affects their genetics not size of population or behavior

If it doesn't have a nucleus its a prokaryote

It depends on the surface of the levels. the rougher the surface, the greater is the frictional force. for rougher surfaces, you would need to exert greater force to move the object. the concept is that, you must overcome the frictional force in order to bring the object into motion. this is the reason why we add lubricants to the joints so they could easily move. this answer was on