The Mystery of Why Leaves Change Colour in the Autumn

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Although the chemistry of autumn colors has long been known, there is still a lively debate among scientists about why trees evolved to have vibrant, fiery leaves every fall.

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Research suggests that trees evolved the pigments for autumn colors later than the ability to break down chlorophyll. Autumn colors are a phenomenon of the Northern Hemisphere.

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The true cause of the colorful foliage of autumn is still a mystery: scientists are still debating why yellow and red autumn leaf colors evolved in trees.