Sub-Saharan Africa is home to what percent of the global HIV/AIDS epidemic?
A) 25% B) 10% C) 5% D) 50% E) 70%
E) 70%
Environmental & Atmospheric Sciences
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Carbon-14 dating is based on the ratio of the parent isotope ____________________ to the daughter
isotope ____________________. Fill in the blank(s) with the appropriate word(s).
Environmental & Atmospheric Sciences
Global warming will likely affect forests by
A) shifting most forest types toward the equator. B) increasing rates of photosynthesis. C) decreasing their overall extent. D) all of the above E) none of the above
Environmental & Atmospheric Sciences
Domestic cattle production and rice agriculture release relatively large amounts of which gas into the atmosphere?
A) Carbon dioxide (CO2) B) Chlorofluorocarbons (CFCs) C) Methane (CH4) D) Ozone (O3) E) Water vapor (H2O)
Environmental & Atmospheric Sciences
During a La Niña phase, excess warm water accumulates in
A. A. B. B. C. C. D. D.
Environmental & Atmospheric Sciences