When it appears that it is no longer profitable to continue fishing as a result of overfishing, the fish populations are said to be ____ extinct.
A. locally
B. commercially
C. economically
D. biologically
E. ecologically
Answer: B
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In what sense do we say we are looking back in time when we are looking at the stars?
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Although the first GPS satellite was put into orbit in the ___________, GPS did not provide global coverage until _______.
A) 1960's; 1990 B) 1970's; 1995 C) 1970's; 1990 D) 1980's; 1995 E) 1990's; 2000
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a. ?El Niño. b. ?La Niña. c. ?the Southern Oscillation. d. ?the Ekman Spiral. e. upwelling.?
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A. gleization B. podzolization C. calcification D. laterization E. salinization