Which of the following provides the major chunk of labor in much of the underdeveloped world?

Name: Which of the following provides the major chunk of labor in much of the underdeveloped world?
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In much of the underdeveloped world, human labor provides the preponderance of energy. The principal supplements to human energy are animals, wood, fossil fuel, nuclear power, and, to a lesser and more experimental extent, the ocean's tides, geothermal power, and the sun.

Which of the Following Provides the Major Chunk of Labor