What are some of the major problems with using cellulosic ethanol?
What will be an ideal response?
Producing cellulosic ethanol is not yet affordable, and growing switchgrass requires even more land than corn. More research is also needed to determine possible environmental impacts.
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How does natural selection make populations more adapted to their environments?
What will be an ideal response?
This urban form model describes how highways disperse central-city activities around the region
A) peripheral model B) sector model C) multiple-nuclei model D) concentric zone model
What evidence shows that Yellowstone is a hot spot?
A) basalt flows B) extinct volcanoes C) a geyser D) metamorphic rock banding
The primary source of water vapor and carbon dioxide for Earth's early atmosphere was most likely ____
A) photosynthesis B) ozone reactions C) outgassing D) nitrogen chemical reactions