Question

question 7
b - cells, t - cells, and macrophages are all types of ______________.
white blood cells
skin cells
red blood cells
platelets

Explanation:

B-cells and T-cells are lymphocytes, a subset of white blood cells, and macrophages are a type of phagocytic white blood cell. All three play roles in immune defense, which is the primary function of white blood cells. Skin cells, red blood cells, and platelets have unrelated functions (structural/protective, oxygen transport, blood clotting respectively).

Answer:

white blood cells