The center of gravity of a baseball bat is
A. in its center.
B. closer to the handle.
C. closer to the heavy end.
D. slightly away from its center of mass.
Answer: C
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Which city in the Middle East has emerged as one of the busiest centers of global air travel?
A) Beirut B) Istanbul C) Dubai D) Cairo E) Tehran
Two species of insects do not interbreed because their sexual organs will not fit together. This is an example of
A. sympatric speciation. B. allopatric speciation. C. a prezygotic reproductive barrier. D. a postzygotic reproductive barrier.
The dominant processes in an ecosystem are
A) life and death B) damage and restoration C) energy flows and chemical cycles D) interactions of biota and geologic environment
China's Three Gorges Dam on the Yangtze and Vietnam's Nam Theun Dam on the Mekong demonstrate that
A) large hydroelectric projects can be carried out with little to no environmental impact and human displacement. B) hydroelectric installations cannot produce enough energy to compete with fossil fuel plants. C) the air pollution from the dams will have to be monitored constantly to protect human health. D) the major impacts on downstream communities will have to be carefully studied.