In an enzyme-mediated reaction, molecules are changed, and is formed.

Enzymes catalyze reactions by lowering the activation energy necessary for a reaction to occur. ... In an enzyme-mediated reaction, substrate molecules are changed, and product is formed. The enzyme molecule is unchanged after the reaction, and it can continue to catalyze the same type of reaction over and over.

Explanation:

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igneous rock formed from below the surface would have more crystals because

answer: because magma cools more slowly than lava