Other than using a Nitrox system, the only effective way to counteract nitrogen narcosis is to:

A) lower the nitrogen partial pressure through controlled ascent.
B) increase the nitrogen partial pressure through controlled descent.
C) lower the nitrogen partial pressure through controlled descent.
D) increase the nitrogen partial pressure through controlled ascent.


Answer: A) lower the nitrogen partial pressure through controlled ascent.

Environmental & Atmospheric Sciences

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Ensemble forecasting

A) should give the same results for all simulations. B) can give a more accurate probability of future weather. C) will soon allow accurate forecasting 4 to 6 weeks into the future. D) combines the results of British, European, and American models. E) all of the above

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In 2009, the world population is about

a. 6.0 billion people b. 2.0 billion people c. 9.0 billion people d. 8.0 million people e. 7.0 billion people

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The cells that allow the immune system to respond more quickly to an antigen when it is encountered again later in life are called

A) innate immune cells. B) helper T cells. C) memory cells. D) killer T cells.

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Which of the following marine resources is used to make wallboard or sheet rock?

A) Evaporative salts B) Manganese nodules C) Phosphorite D) Sand and gravel E) Sediments rich in tin

Environmental & Atmospheric Sciences