The Columbia River dam system has benefited many people, but it has also ____.
A. sharply increased populations of invasive salmon
B. sharply reduced populations of wild salmon
C. sharply reduced populations of herring
D. inhibited migration patterns of trout
E. inhibited reproductive cycles of common carp
Answer: B
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The energy of the vibrations or the magnitude of an earthquake is reported using the __________.
a. Seismograph numbers. b. Richter scale. c. Magnitude scale. d. Bigone scale.
The goal of all scientific inquiry (or scientific method) is:
a) world dominion b) To make everyone rich and happy c) World peace d) Predicting natural events based on known patterns e) None of the above
How do modern telescopes prevent problems of earlier telescopes that limited mirror size and stability during temperature changes?
A) They only use telescopes in space to avoid the atmosphere. B) They use a digital imaging system and process the image to remove distortions. C) They use a mirror that is constantly adjusted in shape to adjust for changes in atmospheric distortions. D) They use a super refraction system that uses a series of small lenses that avoid chromatic effects to collect more light than previously possible.
Conservation biologists define a region as a biodiversity hotspot if ________
A) there is an unusually large number of endemic species thriving B) there is an endemic species protected by a captive breeding program C) species richness is unusually high and protection is required D) there is at least one umbrella species to be protected E) there is an unusually large number of endemic species threatened by humans