A community with hundreds of different types of primary producers, a few herbivores and only one carnivore, has
A. Little complexity
B. Low productivity
C. A great deal of complexity
D. A great deal of productivity
E. Little diversity
Answer: A
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Which of the following best matches the description?Entrapment and transfer of heat from the sun to a building without use of machinery.
A. geothermal energy B. overburden C. photovoltaic cell D. resources E. black lung disease F. acid mine drainage G. passive solar system H. secondary recovery I. active solar system J. surface mining K. underground mining L. nonrenewable energy sources M. renewable energy sources N. liquefied natural gas O. reserves
The Peru (Humboldt) Current is an example of which of the following types of currents?
A) Eastern Boundary Current B) Equatorial Counter Current C) Northern Boundary Current D) Southern Boundary Current E) Western Boundary Current
Asia was not heavily glaciated in the Pleistocene because of ________
A) lack of adequate precipitation B) tropical latitudes C) warm ocean currents D) heavy vegetation cover E) high mountain ranges
MgCl2 crystals are composed of
A. a multitude of Mg2+ ions and Cl- ions grouped together in a three-dimensional array with a 1:2 ratio of Mg2+ to Cl-. B. units composed of six Mg atoms and six Cl2 molecules. C. a two-dimensional array of [-Mg-Cl-Cl-] units. D. groups of Mg2+ ions and Cl2 molecules. E. units of MgCl2 molecules held together by dipole interactions.