Radon is an odorless radioactive gas that you cannot taste or see. Exposure to this naturally occurring gas can be dangerously high in any home in North America
Homes must be specially tested for exposure levels for residents to understand their risks. If risks are high, venting systems can be installed to significantly lower indoor levels of exposure. The most likely health problem associated with long-term exposure to this radioactive gas is A) a stroke or heart attack.
B) lung cancer.
C) elevated blood pressure.
D) obesity leading to diabetes.
B
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The city plus its surrounding built-up suburbs is the
A) central city. B) urbanized area. C) metropolitan statistical area. D) consolidated metropolitan statistical area. E) regional government federation.
What term describes the number of plant and animal species present along with the variety of genetic material present in these organisms?
a. biodiversity b. biomes c. bioculture d. biodiversity hotspot e. biozone
Most public rangelands are in poor condition due to
A. Overcrowding of private livestock B. Excessive populations of wild ungulates C. Too many publicly-owned animals on public lands D. The lack of water E. Excessive urban settlement in the west
The three eras that have taken place since the end of the Precambrian from oldest to youngest are the
____________________, ____________________, and ____________________. Fill in the blank(s) with the appropriate word(s).