What kind of molecule is an enzyme?

Explanation:

An enzyme is a proteinous molecule that serves as a biological catalysts in living cells, regulating the rate of biochemical reactions. Like every other proteins, enzymes are made up of building blocks- amino acids, which are arranged in such a way that forms a specific 3D structure responsible for the specificity and functioning of that particular enzyme.

Enzymes catalyze a reaction by binding to the substrates or reactants of the reaction making the reaction faster due to its 3D shape. Enzymes are usually specific in their actions.

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers