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a tough substance made from a modified polysaccharide that contains nitrogen. It is the main...

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parenchyma cells that are exposed to light and contain many chloroplasts. Chlorenchyma cells...

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chemicals used as the propellants in aerosol sprays, as coolants in fridges, air conditioners...

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a green pigment in plants, which is needed for photosynthesis.

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organelles that only occur in the green parts of plants. They contain the green pigment...

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