Why did life expectancy rise steadily between 1850 and 1900?

Germ Theory

Explanation:

Germ Theory was in its early stages and with its discovery brought on a cascade of medical discoveries, all of which helped save the lives of the afflicted.

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folds are formed when heat and pressure is applied to the rock. the higher the temperature, the more pliable rocks become. folds are more likely to occur when the deformation caused by the compression is applied slowly. faults are defined as the displacement of rock that were once connected along a fault line.

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