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20090421
59407923
April 21, 2009: Shapes
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?
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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