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pollutant gases such as nitrogen monoxide and nitrogen dioxide. They are produced during combustion, especially at high temperatures. They are harmful to human health. They can react with water to make nitric acid, which may end up in the soil, where it makes nitrates, which is of use to growing plants.
stage of photosynthesis that does not require light energy to occur.
the small amount of air that always remains in the lungs during breathing.
cells that are formed during secondary growth by the vascular cambium ring just to the inside of...
single-celled organisms with all life functions performed within the cell.