Question

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

Explanation:

The kidneys are part of the urinary system. Their main role is to filter the blood. They remove waste products (like urea) and excess fluids from the blood. These waste products and excess fluids are then excreted from the body in the form of urine. The respiratory system is for gas exchange (taking in oxygen and expelling carbon dioxide), the lymph system is part of the immune system and helps with fluid balance in tissues (but not the main blood - filtering as kidneys do), the nervous system is for transmitting signals, and the digestive system is for breaking down food.

Answer:

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