As autumn approaches, the amount of available sunlight decreases. This signals the tree that winter is approaching and that it is time to begin the process of shedding its leaves. As a result, the production of chlorophyll ceases and breaks down. Because of this, the green color of the leaf disappears allowing the other pigments to show off their hues.
![](http://photos1.blogger.com/blogger2/7683/1386/400/changing_leaf_image.png)
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