Carriers of cystic fibrosis may be better able to survive diseases involving severe diarrhea. What would happen to the frequency of the recessive allele for cystic fibrosis if there was a widespread epidemic of a disease which brings about severe diarrhea?

Cis correct i think

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

Photosynthesis. . .

Bees shall never produce milk no matter what but this is a joke and the answer is a breast that produces milk.