Pollutants vary in their persistence, which means some ____.?
A) ?reside in the environment for thousands of years, whereas others last for only a few minutes
B) ?are toxic to organisms in tiny concentrations
C) ?may seem harmless, but could be very deadly to distant species
D) ?may interfere directly or indirectly to marine populations
A
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Regions on the rain-shadow (leeward) side of mountains (such as the Rockies and Andes) are generally
A) humid continental. B) tundra. C) semi-arid. D) Mediterranean.
"Arithmetic Density" is determined by
A) the number of people per unit area. B) the number of people per unit of farmland. C) the number of people per unit habitable land. D) the number of people in urban areas divided by the number of people in rural areas.
Following the arrival of Europeans to the North American continent what happened to the Native American population?
A) They began trading with the Europeans and benefited economically. B) European diseases and disruptions reduced their numbers by more than 90%. C) They migrated to better land in the interior of North America. D) The European educational system transformed their way of life, enabling them to benefit from early globalization. E) They continued as before, having little contact with European immigrants.
Which of the following is the source of the carbon atom in the CO2 produced when oxalosuccinate is converted to a-ketoglutarate in step 3 of the citric acid cycle?
A) acetyl CoA B) the original oxaloacetate C) succinate D) none of these