The function of the red blood cells is

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To defend the body against harmful infections

To transport oxygen and carbon dioxide

To clot the blood at the time of injuries

To produce the white blood cells

answer is B.

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Detailed Solution

Concept: The blood is made up of liquid and solids. It has four main compositions: Erythrocytes (red blood cells), leukocytes (white blood cells), Platelets and Plasma. Haemoglobin is the protein present inside of red blood cells that carry oxygen.
Red blood cells evacuate carbon dioxide from your body, transporting it to the lungs for you to breathe out. The red blood cells are made inside your bones, within the bone marrow. The solid part of the blood includes red blood cells(erythrocytes), white blood cells (leucocytes), and platelets. The erythrocytes carry oxygen throughout the body. The shelf life of every RBC lives is about 4 months.
Hence, the correct answer is option 2.

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