People who live to 100 are more likely to live in a

  a.  Highly populated city

  b.  Rural area

c.  Seaside community

d.  In the mountains



Answer: d. In the mountains

The mountains are most healthy because there is a lower oxygen level in the higher altitudes. Certain cancers, such as colorectal cancer, thrive in higher oxygen levels. Urban areas are, of course, the least healthy, thanks to pollution and chemical exposure.

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