Concept:White blood cells are present in both blood and lymph.Explanation:Blood contains plasma, red blood cells, white blood cells, and platelets.Lymph is a fluid that comes from blood plasma and contains lymphocytes, which are a type of white blood cell.Red blood cells are not normally present in lymph.Fats are not a common cellular component of blood.Thus, the component shared by both blood and lymph is the white blood cell.Answer:D. white blood cell