What is the purpose of a root hair and what helps it carry out its function?

Explanation:

Root hair helps in absorption and this is enhanced by its large surface area. Water moves from the soil water to the root hair cytoplasm through osmosis. This is because osmosis allows for movement from a region of higher concentration which is the soil water to the region of low concentration which is root hair cell cytoplasm.

Root hairs absorbs water and mineral nutrients that are available in the soil and taking it up through the roots to the rest of the remaining part of the plants. Absorption is possible because of the large surface area the root air has.

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.