11. Which of the following is contained within blood? o White blood cells
O Plasma
O Platelets
OAll of the above

Found this on google, "The liquid part, called plasma, is made of water, salts, and protein. Over half of your blood is plasma. The solid part of your blood contains red blood cells, white blood cells, and platelets. Red blood cells (RBC) deliver oxygen from your lungs to your tissues and organs."

So the answer to your question is all of the above.

alternate days of the week that you perform that activity