Humans breathe in …, oxygen, water, carbon dioxide, sugar, Humans breathe out …, oxygen, water, carbon dioxide, sugar, Fish use … to breathe., lungs, gills, stomata, skin, Plants use tiny holes called …, lungs, gills, skin, stomata, Air enters the body through the ..., lungs, bronchi, nose, alveoli, Smoke can hurt the …, lungs, shoes, ears, books, The trachea is a tube that carries air toward the …, legs, lungs, fingers, toes

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