A hypothesis Is when someone thinks of the answer and a theory is when a group of people think of an answer
I think its a because risk actually means exposure to danger our sacrifice your self plz mark as brainly
Answer: Immune system
Explanation:
Lymphocytes are a class of white blood cells (leukocytes) involved in immune response when activated by the a foreign molecule (an antigen). B lymphocytes develop in the bone marrow of mammals and are responsible for the production of circulating antibodies.
Thus, lymphocytes are associated with the immune system.
