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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.
cellular respiration that takes place when free oxygen is absent
an organism that helps to spread a disease, but is not infected with the disease.
organelles that only occur in the green parts of plants. They contain the green pigment...
a drug that inhibits (slows down) the action of the nervous system.
an individual who donates an organ for the purpose of transplanting it into another person in an...