What do acids and bases have in common?
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A. They are both corrosive and can burn skin.
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B. They both have pH values lower than 7.
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C. They are both found in many foods.
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D. They are both commonly used as cleaners.

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.