Question

multiple choice question
what is a buffer?
a physical barrier to the movement of seawater
a fish that can inflate itself for self - defense
a substance that prevents drastic changes in the ph of a solution

Explanation:

In chemistry, a buffer is a solution containing either a weak acid and its salt or a weak base and its salt, which resists changes in pH when small amounts of acid or base are added.

Answer:

A substance that prevents drastic changes in the pH of a solution