What is the main gas in the air?, Nitrogen, Oxygen, Which gas do humans need to breathe?, Carbon dioxide, Oxygen, Which gas do plants need for photosynthesis?, Carbon dioxide, Water Vapour, What should we do to help reduce air pollution?, plant more trees, burn rubbish, use public transport, save energy, What shouldn't we do to help reduce air pollution?, throw rubbish, cut down trees, use paper bag, walk to school, What makes up the largest part of the air?, Nitrogen, Other gases, What is air like?, Air has no colour, no smell, and no taste., Air has colour, no smell, and no taste., How much of the air is oxygen?, 21%, 78%, What does carbon dioxide help plants with?, It helps plants with photosynthesis., It helps plants with respiration, What gas helps plants grow?, Carbon dioxide, Oxygen
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