Question

blood cells are produced in the:
a spleen.
b thymus gland.
c red bone marrow.
d liver.

Explanation:

The red bone marrow contains hematopoietic stem - cells which are responsible for producing blood cells. The spleen filters blood and stores blood cells, the thymus gland is involved in T - cell maturation, and the liver has functions like detoxification and metabolism but is not the main site of blood cell production.

Answer:

C. red bone marrow