Heat is produced by matter. Matter is made up of atoms and molecules and energy causes the atoms and molecules to always be in motion. Nonrenewable energy sources such as fossil fuel oil , and coal , When coal, oil, and natural gas are burned in a power plant, which then turns the turbine in a generator, and produces electricity.
The heat is generated using non-renewable resources such as coal, natural gas, or/ and oil. This is the cause because the natural process of heat comes through these given variety of generators ways.
The correct option is D. Both carbohydrates and fat produce energy within the cell, but the amount of energy produce by fat for each one gram of food is much more than that of carbohydrate. Fat in the food is absorbed into the body in form of triglycerides.