Pesticide resistance is
A. accumulation of pesticides in fatty tissues.
B. only effective to control rodents.
C. the death of individuals of a nontarget species.
D. pesticide tolerant individuals who survive and reproduce, which makes the pesticide less effective for future pest generations.
Answer: D
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Water diversion and irrigation has allowed humans to grow crops in areas where natural supplies have been limited. A major challenge that exists in these regions has been ________
A) high pesticide use B) soil erosion C) salinization of soils D) low crop diversity E) high trophic-level efficiency
Geosynchronous satellites that always appear at the same place in the sky are
A. beyond the pull of Earth's gravitational field. B. moving at a speed just short of escape velocity. C. stationary in space. D. orbiting Earth with a 24-hour period.
Where does most of the material on the continental shelf come from?
A) Erosion from the adjacent continent B) Sediments transported from rivers C) Accumulations behind natural dams D) New crust formation
Pangaea is ____________.
a) another name given the Alaskan earthquake of 1964 b) a portion of the mid-Atlantic ridge c) a German word for "plate tectonics" d) the name of a supercontinent meaning "All Land" e) all of the above