The process where all chemical reactions within organisms enable them to maintain life is known as
a. digestion.
b. photosynthesis.
c. citric acid cycle.
d. metabolism.

The answer is the option d. metabolism.

Metabolism is the set of the chemical reactions that happens in the organism to transform nutrients (food) in energy and the products that conform the cells and all the constituents of the body.

Iwould you figure it out but you don't have a picture or in your question as to what the physical property you're looking for is

Answer    "a salt" would be the best answerexplanationsalts can be defined as ionic compounds that are neither acids nor bases. nacl is an example of a salt, and its ionic.an enzyme is an organic compound which is covalently bonded, not ionically bonded.acids are generally held together by covalent bondsan element does not need any bonds to exist