The excretory system of the body controls the fluids of the body, including removing excess and unnecessary fluids from the body. The excretory organs include the kidneys, lungs, liver, and the skin. The system helps the body keep the right amount of water, salts, and nutrients. In addition, the urinary system is a part of the excretory system. The urinary system controls the balance of water and chemicals in the body for it to function properly. The system works with the lungs, kidneys, and the intestines. The urinary system also produces, stores, and eliminates urine (pee), which is the fluid released by the kidneys.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.