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Ivan was playing under the kitchen table when he stood up suddenly and bumped his head. He pointed at the table and sternly said, "Naughty table!" This is an example of _____.
Leukocytes
White blood cells that are part of the immune system, helping to fight off infections and diseases.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration, essential to plant photosynthesis.
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide occurs.
Diaphragm
A dome-shaped, muscular partition separating the thorax from the abdomen in mammals, playing a major role in breathing by contracting and expanding the lungs.
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