In an aquatic ecosystem experiencing eutrophication, levels of dissolved macronutrients ________ and dissolved oxygen levels ________
A) remain stable; increase
B) increase; increase
C) decrease; increase
D) decrease; decrease
E) increase; decease
E
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All of the following are external parasites except
a. fleas and ticks b. Mosquitoes c. Mistletoe d. Tapeworms e. athlete's foot fungus
Which of the following statements is TRUE regarding potential results of climate change in North America?
A) high latitude (polar) and alpine environments will likely experience the most dramatic change B) the Great Lakes region will face drought on a more frequent basis C) urban areas will become cooler than surrounding rural areas D) sea level rise is not anticipated for North American coastlines E) the Great Plains and Texas will receive more precipitation
Sharp ridges called ________ separate adjacent glacially carved valleys.
A. moraines B. cairns C. arêtes D. tarns E. cirques
The term greenhouse effect describes the ____.
A. radiation of heat energy into space B. trapping of heat energy in the atmosphere C. effect climate change has on the economy D. efforts of the White House to support environmental legislation E. shrinking of the ozone layer