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While small organisms can transport material from one cell to another by diffusion, this process is too slow for larger organisms. Most plants need to move water and minerals a considerable distance from the roots to the rest of the plant. Similarly, sugars need to be transported from the leaves to all other parts of the plant. The water and sugar solutions that are moved around the plant are commonly called plant sap. Plants have two separate transport systems - the xylem, which moves water and minerals from the roots to the rest of the plant, and the phloem, which moves sugars (along wit...