Question

which of the following is not a function of leukocytes?
a they fight infection.
b they destroy dead or dying body cells.
c they take oxygen to cells.
d they recognize and kill cancer cells.

Explanation:

Leukocytes (white blood cells) are part of the immune system. They fight infections (A), destroy dead/dying cells (B), and recognize/kill cancer cells (D). Taking oxygen to cells is a function of red blood cells (erythrocytes), not leukocytes.

Answer:

C. They take oxygen to cells.