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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.
the formation of a relatively complex chemical compound from simpler substances.
minerals and vitamins that are taken as nutritional supplements to regular food (in the form of...
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...