Answer:
Permanent settlements led to population increases. As populations grew, societies became more complex, as well as some social institutions that are older than civilization, but that fully developed in early civilizations: division of labor, social hierarchy, and even slavery.
In other words, as early civilizations became more complex, the relative egalitarianism of nomadic and semi nomadic societes disappeared.
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:
Answer: Initial benefits were $13 a week for married Veterans and $9 for unmarried Veterans.
Explanation:
