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What is a precursor?​
a.A substance that is recycled through the liver and intestines
b.​A sign or symptom of a clinical vitamin deficiency disorder
c.​A substance that is used to synthesize another compound
d.​A conditionally essential vitamin
e.A sign or symptom of a subclinical vitamin deficiency disorder​

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Answer:

A precursor is c) a substance that is used to synthesize another compound.

Explanation:

A precursor in chemistry is a compound that participates in a chemical reaction to obtain another compound. Also, they could be predecessors of other compounds in a metabolic pathway such as tryptophan and serotonin; tryptophan is the metabolic precursor for serotonin.

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