Answer:
holding a basketball in the air
Explanation:
the ball has potential to have a certain amount of energy but hasn't exerted it yet.
Answer:
D. a reactant that is catalyzed by an enzyme
Explanation:
um
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The number of protons in the nucleus always varies among atoms of different elements.
Every element has a different number of protons than every other element.
it would be the third i think hope that helps
