Question

select the correct answer.
what part of the excretory system excretes carbon dioxide?
a. urethra
b. lungs
c. kidneys
d. urinary bladder

Explanation:

The lungs are part of the respiratory system which is also involved in excretion. During respiration, oxygen is taken in and carbon dioxide is expelled. The urethra is for urine excretion, kidneys filter blood and form urine, and the urinary bladder stores urine.

Answer:

B. lungs