what is the first organ in respiratory system, nose, brain, mouth, air sacs, what the organ that pumps blood to all body parts, heart, blood vessels, lungs, trachea, what the substance that when reacts with cardon dioxide change into milky color, iodine, limewater, starch, water, the chest moves up during, breathing in, breathing out, we need what to protect our eyes, glass, saftely goggles

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