Examlex
Chemotherapy usually involves a combination of drugs in order to:
1) reduce the adverse effects.
2) guarantee that all cancer cells are destroyed.
3) be effective in more phases of the cell cycle.
4) totally block the mitotic stage.
Stratospheric Penetrations
The entry or movement of substances or objects into the stratosphere, the second major layer of Earth's atmosphere.
Nitrogen Dioxide
A toxic, reddish-brown gas (NO2) that is a significant air pollutant, resulting from the combustion of fossil fuels and is associated with respiratory diseases.
Air Pollution Regulations
Laws and rules enacted by governments to control the emission of pollutants into the air to protect human health and the environment.
Middle Atmosphere
The layer of Earth's atmosphere situated between the troposphere and the thermosphere, encompassing the stratosphere and the mesosphere.
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