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Sarah and Sue were trying to identify minerals in science class. They initially divided all of the samples based on whether or not they had a opaque and reflective luster. Donald questioned this tactic: "Why are you doing that?" Sarah told him that it helped to classify minerals as A) hard or soft. B) made-man or natural. C) shiny or dull. D) silicates or carbonates.

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i think it might be C)shiny or dull
User Alex Sorokoletov
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