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The kidneys in humans are part of system that performs one of the following functions.

Solution

✅ Correct Option: 2

The kidneys form the excretory system along with the ureters, urinary bladder and urethra. They filter the blood in nephrons, remove nitrogenous wastes such as urea, and regulate water and salt balance. Nutrition is handled by the digestive system, transportation by the circulatory system and respiration by the lungs.

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