Leaves serve as the tree's lungs. A tree "breathes" air in through small openings on the underside of its leaves called stomata. What would happen if a tree couldn't breathe? |
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tadams
Nice and different. Good externals.
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Any hope?
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by Ruth
Created May 13, 2007
10 votes
1 comments
500w x 375h (120KB)
1,062 views
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