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Question
Ultimately, all biofuels are ________, because they are the result of ________.A) geological; sedimentation
B) solar; photosynthesis
C) inefficient; decomposition by microorganisms
D) synthetic; chemical manipulation of hydrocarbons
E) polymers; biological metabolic processes
Answer
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A) wind erosion; water erosion
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D) from unsustainable to sustainable
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