- Life Sciences
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.
liquid that drains out of a landfill and is contaminated with solutes from the waste matter
symbiosis where one organism lives on another (on the outside of another).