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Correct Answer:

Leaves change color because of the presence of different pigments: chlorophyll (green), carotenoid (yellow/orange), and anthocyanin (red). In autumn, trees stop producing chlorophyll due to less sunlight, which allows the other pigments to become visible. This is a chemical change because the chemical composition of the leaf is changing as chlorophyll breaks down and new pigments like anthocyanin are produced.