Biofuels ________
A) could not supply an alternative fuel to gasoline
B) can be created by microbial action or burned directly as wood or dung
C) requires fossil fuel input to produce
D) produces no greenhouse gases when burned
E) is a form of fossil fuel
B
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Differentiate among falls, slides, and flows
A new gravel road is cut into the side of a mountain just north of Anchorage, Alaska. As the snow melts in June, the fine gravel and sand of the disturbed region quickly tumbles into the bottom of nearby streams
The addition of this fine gravel and sand changes the stream by A) decreasing the number of plants and animals that live there. B) decreasing the number of plants but increasing the number of animals that live there. C) increasing the number of plants but decreasing the number of animals that live there. D) increasing the number of plants and animals that live there.
When a cleaner shrimp cleans the mouth of an eel, we see an example of
A) parasitism. B) commensalism. C) predation. D) mutualism.
Smelter emissions often cause what type of adverse environmental degradation?
A) acid mine drainage B) acid rain C) asbestos deposition D) global warming