Yes.
<span>He implemented a set of fair laws that set the basic structure for many governing bodies form thousands of years.</span>
Economic, political, and social issues.
jobs were scarce and cites. there was also famine.
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 answer you're looking for is the first option. I hope this helps!