Question

which organ performs the major role in excreting nitrogenous wastes and excess water from the body?
lungs
colon
skin
kidneys

Explanation:

The kidneys filter blood, excreting nitrogen - containing wastes like urea and controlling water balance. Lungs mainly expel carbon - dioxide, colon is for digestion and feces formation, and skin has minor excretory functions compared to kidneys.

Answer:

D. Kidneys