Many polluted ecosystems, such as those suffering from eutrophication, will recover if humans stop polluting them. This illustrates
A) loss of ecosystem capital.
B) the essential role of keystone species in ecosystems.
C) secondary succession.
D) the natural resilience of ecosystems.
D
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What are the three major uses for groundwater? What will be an ideal response?
?Match the term with the correct description.
A. ?partially decayed plant matter in swamps and bogs B. ?brown coal, low heat content, low sulfur content C. ?soft coal, extensively used as a fuel because of its high heat content and large supplies; normally has a high sulfur content D. ?hard coal, highly desirable fuel because of its high heat content and low sulfur content E. ?mixture of hydrocarbons extracted from shale rock that can be distilled to produce shale oil
The following are examples of export crops and corresponding country of production, except:
A) tea, Kenya B) coca, Cote d'Ivoire C) coca, Ethiopia D) cotton, Benin E) rubber, Liberia
Which of the following objects do you expect to find at the center of a planetary nebula?
A. planet B. black hole C. white dwarf D. neutron star