Final answer:
Endothermic reactions need more energy to break bonds than is released from forming new bonds, resulting in products with higher energy levels, whereas exothermic reactions release more energy than is needed to break bonds, leading to products with lower energy.
Explanation:
Endothermic reactions require more energy to break existing bonds than is released when new bonds form, resulting in the products having greater energy than the reactants. On the other hand, exothermic reactions release more energy than needed to break the bonds, leading to products with lower energy levels. For example, photosynthesis is an endothermic reaction as it absorbs energy.
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