Answer:
The correct answer is kidneys
Explanation:
The main type of nitrogenous waste produced by the living organisms are ammonia, urea, creatinine, and uric acid. These nitrogenous wastes are produced by the metabolism of proteins and excreted by mainly urine.
Mammals in which humans are also involved produce urea as nitrogenous waste which is released from the body through urine. This urine is formed by kidneys which is an excretory organ and helps in excretion of urea from mammal's body.
180 liters of blood are filtered every day by normal adult kidneys and 25 grams of urea is excreted every day by an adult. Therefore kidney s the correct answer.
