Final answer:
Red blood cells are specialized cells that carry oxygen throughout an organism.
Step-by-step explanation:
Red blood cells are specialized cells found in the blood that function to carry oxygen throughout an organism. They are created in the bone marrow and contain a protein called hemoglobin that binds to oxygen molecules. The shape of red blood cells, which is disc-shaped and biconcave, allows for a larger surface area for oxygen exchange.
Learn more about Red blood cell function and characteristics