For most domestic animals, trophic-level efficiency is usually ________
A) approximately 30%
B) approximately 20%
C) dependent on what the animals were fed
D) greater than 10%
E) less than 10%
D
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In which way has the U.S. been directly responsible for exporting much of their pollution and waste to poorer countries?
A. by moving polluting factories to the poorer countries B. by importing polluting technologies from poorer countries C. by passing laws that restrict the release of toxic chemical into the U.S. environment D. by insisting that the environmental quality of the U.S. be improved
Driving along a highway, you start noticing plants with tiny blue flowers. Several miles later, these flowers are very abundant. Then even further, the flowers become less abundant, until finally, you do not see them at all
The regions with just a few of these plants represented the plant's A) optimal range. B) zones of stress. C) resource reservoirs. D) optimal habitats.
These vertical shafts of light are created by slowly falling crystals of ice
What will be an ideal response?
A rapidly growing city within a humid climate zone experiences a land use change from predominantly cropland to mostly urban/suburban. A likely natural response would be
A. reduced infiltration - reduced flooding. B. increased infiltration - increased flooding. C. reduced infiltration - increased flooding. D. increased infiltration - reduced flooding.