Answer:In 1947, Salk took a position at University of Pittsburgh, where he began conducting research on polio, also known as infantile paralysis. By 1951, Salk had determined that there were three distinct types of polio viruses and was able to develop a "killed virus" vaccine for the disease.
Explanation:
The first answer is right
Answer:
The photo is blurry i an ssee the questions
Answer:
Reparations.
Explanation:
The Treaty of Versailles that formally ended World War One, imposed reparations of 132 billion gold marks on Germany. The payments had to be made mainly to France and Britain. The amount was exorbitant and the German economy was so troubled in the 1920s that it could not pay those reparations.
if most members in congress from his states are republican, if his states has a republican governor, and his state cast electoral votes in the last election for the republican candidate.
