Plant roots grow little fibers called root what that absorbs water from the soil?

Root hairs

Explanation:

The root system of the plants absorbs water and minerals from the soil and transports it to the various parts of the plant.

The root hairs are the fiber like structure which are in direct contact with the water inside the earth.

These structures travel to the depth of the ground and helps in absorption and transport of water and minerals which is essential for the growth of plants.  

they deliver oxygen to the blood

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