Concept:Blood is a connective tissue made up of a liquid medium and cellular components suspended in it.
Explanation:Blood in man consists of four main components.
These are plasma, red blood cells, white blood cells, and platelets.
Plasma is the liquid part that carries the blood cells.
Red blood cells transport oxygen, white blood cells fight infection, and platelets help in blood clotting.
Therefore, all four listed components are necessary to make up human blood.
Answer:D. red blood cells, white blood cells, plasma and platelets