Which of the following statements is FALSE concerning leukocytes in the human body?
A. Leukocytes contain hemoglobin.
B. Leukocytes are white blood cells.
C. Leukocytes move actively by amoeboid movements.
D. There are the same number of leukocytes as erythrocytes in plasma.
Only red blood cells carry hemoglobin, the substance responsible for oxygen and carbon dioxide transport.