Which scientist proposed a link between contaminated water and cholera? a.) curie b.) koch c.) salk d.) pasteur

Answer is Koch.

Cholera is an acute type of diarrheal illness that affected millions of people around the world over the centuries. Vibrio cholerae is the causative bacterium of the disease. It is transmitted by drinking contaminated water of food with vibrio cholerae. The source of the contamination is usually the feces of an infected person or water contaminated with sewage.  

answer; polycythemia is the correct answer;