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The root hair of a plant, shown in the diagram below, is the most efficient way for the plant to absorb water from surrounding soil.
At what point is the flow of water the GREATEST?

Root Hair Growing among a Plant's Root Cells

Explanation

In osmosis, water flows through a cell membrane in the direction of a higher concentration of water molecules to a lower concentration. In this example, the highest initial concentration of water molecules is located in area A, the soil, and the lowest concentration of water molecules is found in area B-the large root hair. The process of osmosis will continue from area A to B until the concentration of water molecules is balanced between the root hair and the soil.

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