why do trees leaves change colors?



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    There are three types of pigments in leaves: chlorophyll, which makes leaves green; carotenoids, yellow, orange and brown; and anthocyanins, reds and purples. During the growing season, leaves are continually producing chlorophyll. As the light wanes and the night becomes longer in the autumn, chlorophyll production ceases and eventually stops, while the carotenoids and anthocyanins present in the leaves show themselves to us as leaves changing color.

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