What is the primary function of red blood cells?
A. Fighting diseases in the body.
B. Transfer oxygen to all parts of the body.
C. Remove carbon monoxide from all parts of the body.
D. Production of substances that lead to blood clotting.
A. Fighting diseases in the body.
B. Transfer oxygen to all parts of the body.
C. Remove carbon monoxide from all parts of the body.
D. Production of substances that lead to blood clotting.