April 21, 2009
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2009-04-21
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Credit & Copyright:
Lilia Rasnovskaya from Ukraine
Shapes: It looks like these leaves are about to fall off. How do trees know to shed their leaves in the winter? Is it the colder temperatures? Is it the length of the day? Have the nutrients in the soil changed? Insect attack?
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Link to It: http://www.naturepicoftheday.com/archive/2009-04-21
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