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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A) 1960's; 1990 B) 1970's; 1995 C) 1970's; 1990 D) 1980's; 1995 E) 1990's; 2000
A condition where the central and eastern tropical Pacific Ocean turns cooler than normal is called?
a. ?El Niño. b. ?La Niña. c. ?the Southern Oscillation. d. ?the Ekman Spiral. e. upwelling.?
In what sense do we say we are looking back in time when we are looking at the stars?
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What soil regime is associated with gray soils with acidic plant litter and effective leaching?
A. gleization B. podzolization C. calcification D. laterization E. salinization