Sweat is composed of mainly water, excess salts and urea, which need to be removed from the body as waste. Its main function is to control body temperature. As the water in the sweat evaporates, the surface of the skin cools. Thus sweat removes waste from the body and cools it down as well.

Circulation of blood is essential for the transportation of nutrients and oxygen to various parts of the body. It also transports waste for removal from the body. 

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Root hairs are the hair-like outgrowths of a plant root.
They are the tubular extensions of the epidermis that greatly increase the surface area of the root. This increases the amount of water and nutrients that the plant can absorb from the soil.

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Blood vessels carry blood to different parts of the body.
There are three major types of blood vessels.
a. The arteries, which carry blood away from the heart
b. The capillaries, which enable the actual exchange of oxygen and nutrients between the blood and the cells
c. The veins, which carry blood from the capillaries back towards the heart.