The sum of kinetic energy and potential energy within a system is called a) thermal energy. b) chemical energy. c) electrical energy. d) mechanical energy.

D) Mechanical Energy

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consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.

it is either c or d and i know for sure it is not a or b