What species is one of the biggest threats to fish populations in the Great Lakes?
A. sea lamprey
B. cod
C. jellyfish
D. wild salmon
E. cutthroat trout
Answer: A
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This area of the United States has the greatest acidity in its precipitation
A) West B) Southeast C) northern Plains D) Northeast
The general pattern of atmospheric carbon dioxide concentration between 1960 and 2010 reveals
A) a steady increase from about 310 ppm to the current 400 ppm. B) no significant increases until the year 2005. C) mitigation of an increasing trend due to reduced use of fossil fuels. D) that most of the increase is the result of agricultural wastes and deforestation.
Which of the following locations would contain large, angular rocks that broke away from bedrock and moved downhill?
A. location 1, along the margins of a glacier B. location 2, along a steep mountain front C. location 3, in sand dunes D. location 4, along a beach E. location 5, on relatively deep seafloor
During the end Permian mass extinction, the die-offs were so extensive, ________ or more of animal species went extinct.
A. 47% B. 25% C. 80% D. 70%