Concept:Excretory organs remove waste products of metabolism from the body.
Explanation:The lungs expel carbon dioxide (
CO2) and water vapour during exhalation.
The kidneys filter blood and form urine, removing urea, excess water, and salts.
The skin helps excretion through sweating, which releases small amounts of urea and salts.
These three organs therefore fit the definition of excretory organs in animals.
Structures such as the stomach, intestines, bladder, heart, brain, spinal cord, nerves, liver, and spleen are not primarily excretory organs as a group.
Answer:B. Lungs, kidneys, and skin