Question

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what is the function of the kidneys?
filtering waste products and excess fluids from the digestive system
filtering waste products and excess fluids from the blood, which are then eliminated from the body as urine.
filtering waste products and excess fluids from the respiratory system
filtering waste products and excess fluids from the lymph system
filtering waste products and excess fluids from the nervous system

Explanation:

The kidneys' main role is to filter the blood. They remove waste products (like urea) and excess fluids. These filtered substances are then excreted from the body as urine. The digestive system deals with food digestion, the respiratory system with gas exchange, the lymph system with immune - related fluid transport, and the nervous system with nerve impulse transmission. None of these systems are the primary target for kidney filtration.

Answer:

Filtering waste products and excess fluids from the blood, which are then eliminated from the body as urine.