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Although coal and petroleum are produced by degradation of bio- mass, yet we need to conserve them. Why?
a. Large quantities of biomass were trapped inside the earth for long periods of time under anaerobic, high-pressure conditions, and they were converted into .
b. Coal and petroleum are used in ever-increasing amounts in industry, transportation, kitchens, and other areas because they are rich sources of energy.
c. Although coal and petroleum are produced by degradation of bio- mass, yet we need to conserve them. Why?
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