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7.txt
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2001-04-13
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534b
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11 lines
Most seaweeds (apart from the giant kelps) have no vascular system because
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they need no strengthening tissue, being supported by the water around
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them. Seaweeds have a thick cuticle that covers a thin photosynthetic layer.
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The inner layers are formed from densely packed, thick-walled filaments,
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with a few thin-walled medullary cells between them. These cells may serve
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to transport water through the plant.