Your answer will be C. 1000 meters are in a kilometer (km)
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Explanation:
Without enough water, you can sweat away too much fluid. You can also lose sodium and potassium that your body needs. It's especially true in the heat. When it happens, you may be thirsty, pee less than usual, and your mouth might dry out.
The Activation Energy is the energy required before the reaction activates.
So the answer is "The additional energy required for reactions to occur spontaneously"
