Answer: kidneys
Explanation:
The kidneys remove from the blood the nitrogenous wastes such as urea, as well as salts and excess water, and excrete them in the form of urine. This is done with the help of millions of nephrons present in the kidney.
The answer would be "When a person is too young to make decisions independently", because the person sometimes doesn't understand what he/she is trying to do.
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