Question

question
what is the primary site of blood cell formation in the adult?
answer
red bone marrow
yellow bone marrow
thymus
spleen
i dont know yet

Explanation:

Red bone marrow is the primary site of blood cell formation in adults. Yellow bone marrow is mainly for fat storage. The thymus is involved in T - cell maturation. The spleen filters blood and has some role in immune response but not the primary site of blood cell formation.

Answer:

Red bone marrow