Question

1. where are white blood cells made?

a. in your bones
b. in your thymus
c. in your brain
d. in your heart

Explanation:

White blood cells (leukocytes) are produced in the bone marrow, which is inside bones. The thymus is involved in T - cell maturation (not production of all white blood cells), the brain and heart do not produce white blood cells. So the correct option is the one stating they are made in bones.

Answer:

a. in your bones