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There are so many ways you can exert and use energy in science.
For example: you exert effort { you exert energy}

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Energy is used in science as fuel for electricity. There are many types of energy, heat energy, is one of them. Heat energy is used for the plants, the sun exert energy so that the plants can make their own food via photosynthesis. Light energy is also another energy, they used the light energy to produce electricity

Hope this helps =)
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