Assertion: root hair's surface area | /r/HasProperty | increased by internal air spaces
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Source sentences:
text: a thin membrane for efficient absorption - short diffusion distance, they have a thin cell wall, again reduces the distance for water transfer in osmosis, a large permanent vacuole to absorb and store (temporarily) as much water as possible, The surface area of the roots is increased by root hairs and the surface area of leaves is increased by the flattened shape and internal air spaces.