Irdk I just need the points
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.
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to believe that they were merely assisting.
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Global warming
Population increase
Resources depletion
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the walls of the detention barracks became the voice of the men held inside. Through frustration, fear, anxiety, and possibly even boredom, many detainees wrote or carved their thoughts into the soft wooden walls
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