May I please see the entire table so I can answer your question.
The answer is D. Headwaters
The answer is climate and weather.
Answer:
An example of zymogen is pepsinogen. Pepsinogen is the precursor of pepsin. Pepsinogen is inactive until it is released by chief cells into HCl. The latter partially activates pepsinogen. Pepsinogen will be fully converted into pepsin when an inhibiting peptide unit is removed.
Explanation:
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