Final answer:
T cells are a type of white blood cell that play a role in the immune response. They are part of the adaptive immune system and are born in the red bone marrow.
Step-by-step explanation:
T cells are a type of white blood cell that play a role in the immune response. They are part of the adaptive immune system and are born in the red bone marrow. T cells then migrate to the thymus gland where they further mature.