Which describes fat? a: a carbohydrate that produces energy b: a nucleic acid that directs cell function c: a lipid that stores energy d: a protein that speeds up a chemical reaction

The correct answer is (C), this is because (A) talks about producing energy as of where fat is a form of storing energy. (B) is talking about a cell that controls its surroundings which, as we know, is not the job of fat. That leaves (D) to rule out as it is a textbook definition of an enzyme.

the answer is d. matter from the air combined with the steel wool.