In what country are powdered rhino horns from Sub-Saharan Africa valued as a traditional medicine?
A) Yemen
B) China
C) Ghana
D) Niger
E) France
B
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What element do astrobiologists consider to be the most essential for the evolution of life?
A) carbon B) silicon C) oxygen D) hydrogen
Upwelling can increase biological productivity, but it is unable to influence weather conditions. Indicate whether the statement is true or false
Which of the following is formed by the reaction of formic anhydride with ammonia?
A) formamide B) N-methylformamide C) N,N-dimethylformamide D) a mixture of two or more of these compounds
Which of the following statements about the term “environmentalism” is TRUE?
a. It is very science-oriented. b. It is a social movement to protect the environment. c. It usually does not include advocacy for the environment. d. It involves scientists trying to solve environmental problems.