According to ncpedia.org, Perhaps the most significant technological advance during World War I was the improvement of the machine gun, a weapon originally developed by an American, Hiram Maxim. They also developed air-cooled machine guns for airplanes and improved those used on the ground, making them lighter and easier to move.
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Poor workers were often housed in cramped, grossly inadequate quarters. Working conditions were difficult and exposed employees to many risks and dangers, including cramped work areas with poor ventilation, trauma from machinery, toxic exposures to heavy metals, dust, and solvents.
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Stock market crashing, Poverty, unemployment
Explanation:
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Galileo was known for being a astronomer. His greatest achievement was for discovering 4 moons of Jupiter. His work also fought conflict with the Catholic Church.
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The answer too this question is B
