What at the main parts of blood and a function for each?

plasma, red blood cells, white blood cells, and platelets

Explanation:

PLASMA: The main role of plasma is to take nutrients, hormones, and proteins to the parts of the body that need it.

RBC: The main job of red blood cells, is to carry oxygen from the lungs to the body tissues and carbon dioxide as a waste product, away from the tissues and back to the lungs.

WHITE BLOOD CELLS:They flow through your bloodstream to fight viruses, bacteria, and other foreign invaders that threaten your health.

PLATELETS: a component of blood whose function is to react to bleeding from blood vessel injury by clumping, thereby initiating a blood clot.

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age range would be the answer