The mountain pine beetle has been responsible for all but ________
A) more crown fires in trees
B) the deaths of large amounts of trees
C) increased runoff and flash floods
D) increased numbers of trees falling onto roads
E) increased nitrogen fixation in soil
Answer: E
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A sample of steel is composed of 5% carbon and 95% iron. Which is the solvent?
A. steel B. iron C. carbon D. Steel is not a solution, it is a mixture. E. A solid cannot be a solvent.
How is sound transmitted through a medium?
A) By rapid vibrations of molecules B) By rapid temperature changes in a medium C) By rapid pressure changes in a medium D) All of these choices
All of the following are typical effects of dam construction except
A. interruption of the normal seasonal variation in flows of water. B. disruption of natural ecosystems. C. increased amount of sediment carried downstream of the dam. D. protecting towns from flooding.
Which of the following scenarios best describes a density-dependent factor limiting population growth?
A) A particularly dry summer shrinks and dries up many ponds in central Canada, causing increased aggression and competition for limited nest sites among female common goldeneyes (ducks). B) A particularly snowy winter makes it difficult for female deer to find food, thus affecting their ability to reproduce. C) A tropical storm strikes one of the Hawaiian Islands and wipes out a population of nénés that had been recovering from near-extinction. D) An April blizzard kills off many migrating barn swallows, which could not tolerate the cold and snow. E) A homeowner sprays her lawn with broadleaf herbicide to kill the dandelions that have started growing there that spring.