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Answer:
The germ theory of disease.
Explanation:
Ignaz Philipp Semmelweis is widely credited with the invention of the use of antiseptics in the reduction of puerperal fever in clinics.
However, the piece of scientific knowledge that he was missing to explain his discovery was the germ theory of disease.
The economic philosophy developed in response to the problem of industrial workers is: a. socialism
In an analytic way, we can say The U.S. government took little action to prevent Nazis from killing Jews. The US were particularly more concerned about dealing with unemployment and national security instead of caring about Jews suffering. Besides that, antisemitism and racism were also part of the American mind, contributing to the little action to prevent Nazis Jewish mass murder. When the US finally got involved in the war they were more interest in winning military campaigns than humanitarian rescue. But Under pressure, President Roosevelt had set up a War Refugee Board early in 1944. It managed to rescue about two hundred thousand European Jews and some twenty thousand others.
