Question

Which one of the following substances is not excreted by the human body?

a. carbon dioxide
b. saliva
c. urea
d. salt ​

Answer 1

the anwer is C. urea is the only one the is not a part of human

Answer 2

Saliva is not excreted by the human body.

Carbon dioxide is excreted by respiration.

Urea is excreted by urine.

Salt is excreted by sweat.