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| navigate by keyword : black cellulose cottonwood distribute distribution ironrodart leaf leaves lignin microbe microbes nature network networking networks pattern patterns plants skeleton skeletons system systems textures tissue tree vascular vein veination veins venation white |
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| A detailed, close-up of a cottonwood tree leaf skeleton. (After a leaf falls to the ground, microbes in the soil consume the leaf's soft tissue and leave only the cellulose and lignin skeleton.) The leaf's vascular network can now easily be seen. |
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