Answer:
Commercial energy sources are those that are bought and sold, such as coal, oil, and natural gas. Subsistence energy sources are those gathered by individuals for their own immediate needs, such as wood, and animal waste List the major sources of energy in the US from highest percentage to lowest percentage.The most commercialized forms of commercial energy sources are electricity, coal, and advanced petroleum products. They are used for electricity generation on the basis of industrial, agricultural, transportation, and commercial development of the different countries of the modern world.
Subsistence: coal, oil, natural gas; sometimes wood, charcoal, animal waste) subsistence energy source. energy source gathered by individuals for their own immediate needs (typical of rural or developing areas) patterns of energy use.