Which of the following mechanisms is not used by human beings for excretion of waste materials from their bodies?
A. Exhalation
B. Perspiration
C. Defecation
D. Transfusion
Answer:D
Which of the following mechanisms is not used by human beings for excretion of waste materials from their bodies?
A. Exhalation B. Perspiration C. Defecation D. Transfusion