Approximately what percentage of plant and animal species have been classified overall
A) 1%
B) 13%
C) 67%
D) 92%
B
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Which of the following are documented negative impacts of dams?
A) flooding, habitat destruction, alteration of river sediment deposition B) alteration of river salinity C) acid deposition D) increased atmospheric carbon dioxide and CFCs E) increased carbon monoxide emissions, decreased rainfall
Which of the following is the only substance that is found naturally in the atmosphere near the Earth's surface as a solid, a liquid, and a gas?
A. water B. carbon dioxide C. ozone D. molecular oxygen
What percent of Russia's farmland had been privatized by 2003?
A) 25% B) 10% C) 50% D) 90% E) 5%
Which of the following geometries is never associated with a carbon atom in an organic compound?
A) linear B) square planar C) tetrahedral D) trigonal planar