Question

which of the following is the best illustration of the difference between metabolism and digestion?
digestion has a wide variety of chemical reactions while metabolism is restricted to only a few reaction types.
digestions must happen first for metabolism to follow it.
digestion requires enzymes for it to take place while metabolism does not necessarily need or use them.
metabolism comprises all of the chemical reactions preformed within the body while digestion is only the breakdown of food within the gi tract.

Explanation:

Metabolism is the sum of all chemical reactions in the body. Digestion is specifically the breakdown of food in the gastrointestinal (GI) tract. Enzymes are involved in both digestion and many metabolic processes. Metabolism has a vast number of reaction types, not just a few. Also, while digestion is a part of the overall metabolic processes (as food breakdown is a precursor for energy - related metabolic pathways), it's more accurate to define them based on their scopes.

Answer:

Metabolism comprises all of the chemical reactions preformed within the body while digestion is only the breakdown of food within the GI tract.