What do all chemical changes require to occur?\nOptions:\n- (A) during the day\n- (B) heating liquids\n- (C) Activation energy\n- (D) wavelengths and photons\n- (E) Burning fuel and air\n- (F) kinetic energy\n- (G) electromagnetic energy\n- (H) direct energy Let's solve this problem gradually.

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All chemical reactions require activation energy to get started. Chemical changes are a result of chemical reactions. All chemical changes require activation energy to occur. So the final answer is (C).
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