All of the following are factors conditions EXCEPT
A) human resources.
B) government regulations.
C) capital resources.
D) knowledge-based resources.
E) infrastructure.
B
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The trickling-filter system and the activated-sludge system both require
A) high levels of oxygen to promote aerobic decomposition. B) high levels of carbon dioxide to adjust the pH of the water for bacterial action. C) the addition of large amounts of chlorine to kill pathogens. D) the addition of large amounts of ammonia as nutrients to support decomposers.
In this grassland ecosystem, where is the most chemical energy located?
A) decomposers B) 1st trophic level C) 2nd trophic level D) 3rd trophic level E) 4th trophic level
Which nonnative species threatens the habitat in Olympic National Park?
A. wild boars B. mountain goats C. gray wolves D. hoary marmots E. mule deer
A ________ stream has an interwoven network of small channels separated by much loose debris
A) meandering B) competent C) high-capacity D) thalweg-less E) braided