Trees don’t simply rely upon temperature to gauge when they should feed off of and subsequently drop their leaves, as an unusually cold summer would be able to fool this method of defense. Instead trees rely upon both temperature and color, in that trees can visually observe the red part of the color spectrum just as human eyes can, and when they do this, they can gauge how much sunlight is being received each day because of a chemical pigment in their leaves referred to as “phytochrone”. This d...
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