Answer:
The correct answer is buffer.
Explanation:
A buffer is a substance that minimizes pH changes by either releasing H+ ions or binding H+ ions. Buffers absorb hydrogen ions in acidic environments, increasing the pH and making the solution more basic. Conversely, buffers release hydrogen ions in basic environments to make the solution more acidic. Maintaining appropriate pH is important for many biological systems both in humans and in other organisms. For example, it is critical that our blood pH is neutral for the proper function of enzymes and the stability of other proteins, yet our stomach pH must be much lower (typically around 2). This very acidic environment is important for the proper activation and operation of enzymes in our stomach and the breakdown of food we eat.
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