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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.

How did presidential reconstruction allow black codes to be passed

Which is the most accurate description of the executive office of the president? groups of advisers who the chief of staff groups of advisers who the president groups of advisers who oversee national security groups of advisers who oversee the economy