How much biomass in tropical coral reefs is attributed to the coral alone?
A) 15%
B) 30%
C) 50%
D) 75%
D
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Which statement best illustrates the "tragedy of the commons?"
A. A factory pollutes a river as much as the law allows. B. Some levels of pollution are life threatening. C. Some activities harm the environment, but others do not. D. Irrigated cropland can be ruined by salinization. E. Cropland can decrease biodiversity.
In 2000, the parliament of which country enacted a law that by 2020 will ban all chemicals that are persistent and can bioaccumulate in living tissue?
A. England B. France C. Switzerland D. Sweden E. Denmark
How does a doughnut hose roll differ from a straight hose roll?
a. the female coupling is on the outside b. both couplings are in the middle c. the two couplings are connected d. both couplings are on the outside
Mt. Everest is the tallest mountain on Earth and its altitude is CLOSEST to ________ meters
A) 90 B) 900 C) 9,000 D) 90,000 E) 900,000