Examlex
Fish move water in only one direction over their gills,permitting countercurrent flow.
Radon Gas
Radon gas is a radioactive noble gas that is colorless, tasteless, and odorless, derived from the natural decay of uranium in soil, rock, and water.
Natural Source
An origin of materials or energy that is found in nature and not artificially created, such as sunlight, plants, minerals, or water.
Environmental Protection Agency
A U.S. federal agency responsible for the regulation and enforcement of laws aimed at protecting human health and the environment.
Elevated Radon Levels
Refers to higher concentrations of radon gas in the atmosphere or in buildings, which is hazardous to health due to its radioactive properties.
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