Which factor decreases the rate of a chemical reaction? a. an inhibitor b. a co-factor c. increased substrate

A. an inhibitor

An enzyme inhibitor is a substance that slows down the action of the enzyme by binding at the active site of the enzyme preventing the binding of the substrate to it. It alters the catalytic activity of the enzyme either by slowing down or simply stopping the catalytic reaction.

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explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.