D. Testable, because a hypothesis is only a persons guess
<h2>Endoplasmic reticulum</h2>
Explanation:
Farther into the cytoplasm is a maze of passageway called the <em>endop</em><em>lasmic</em><em> reticulum</em>. These passageway carry proteins and other materials from one part of the cell to another.
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The option which would most likely result in the greatest decrease in the rate of a chemical reaction is adding an enzyme inhibitor to a reaction catalyzed by an enzyme.
Enzyme inhibitor is known for slowing down any processes, especially when it comes to chemical reactions, so I'd say A is the correct answer.
