What is air mainly composed of?, Carbon dioxide, Nitrogen, Oxygen, How do plants contribute to the air?, They release oxygen through photosynthesis, They release nitrogen through their roots, b. They release carbon dioxide through respiration., Which of the following is NOT a property of air?, It takes up space, It has weight, It can be seen, Which of the following is an example of air pollution?, Planting more trees., Recycling plastic bottles., Burning fossil fuels., How do humans use air for breathing?, We inhale oxygen and exhale carbon dioxide., We inhale carbon dioxide and exhale oxygen., We inhale nitrogen and exhale oxygen.

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