Jonas Salk was an important American medical researcher and virologist, who is mostly known for developing the first successful polio vaccine in 1955.
The answer should be true i remember learning brainiest
The answer for your following question would be : A the government
The government determine what , how and at what prices for a product because cuba established a communist economic system, in which all economic activities in that country are controlled by government
C I know that Canada celibrates queens birthday
Im sorry i cant see the picture but good luck though!