An exothermic reaction<span> is a chemical </span>reaction<span> that releases energy by light or heat. It is the opposite of an </span>endothermic reaction<span>. Expressed in a chemical equation: reactants → products + energy.</span>
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<em>The name for a complex group of organisms is system Hope this helps!</em>
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geologists use rock samples and direct evidence to prove what earth's structure is like.
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I believe the answer is C
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I could be wrong.