Which of the following best describes what happens to an enzyme after it catalyzes a chemical reaction?

The correct option is B. It is unchanged and can be used for the same chemical reaction.

Explanation:

Enzymes can be described as proteins which act as biological catalysts. Enzymes can speed up a reaction. During this process, the enzyme itself doesn't get consumed and hence, it can be reused. Enzymes are specific for a particular type of substrate and hence, they can catalyze only those reactions for which they are specific. Hence, option B is correct.

Other options like option A is not correct because the mass of an enzyme will not change after a reaction.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.