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A. Nephron, functional unit of the kidney, the structure that actually produces urine in the process of removing waste and excess substances from the blood. There are about 1,000,000 nephrons in each human kidney. ... As the filtrate flows through the tubule of the nephron, it becomes increasingly concentrated into urine
B. Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism. The remaining 97–99.5% is lost by transpiration and Gustafson.
C. No such differentiation is observed in the phloem. The primary function of xylem is to transport water and dissolved minerals from the root to different parts of the plant. The primary function of the phloem is to transport the prepared sugars from the leaves to different parts of the plant.
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