Why do trees change color during the fall?

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How do trees know what time of the year it is ?

Oct 9th, 2014

Trees change color during the fall because the shorter days signal  to them to stop photosynthesis, which creates the chlorophyll they use.  The chlorophyll makes the leaves green.



Oct 9th, 2014

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Oct 9th, 2014
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Oct 9th, 2014
Jun 24th, 2017
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