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24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. what is 18-karat gold considered a mixture rather than a pure substance? a) it has a variable composition of other elements and minerals. b) its color is different than pure gold. c) the gold atoms are not arranged in a repeating pattern. d) it can be melted and transformed into a different substance.
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Which leader was the first african american president at two different institutions for higher learning
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The president vetoes a bill proposed to become law by congress. in this situation, what happens to the bill?
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Describe at least three effects of the drug war in mexico.
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