Why do people fight
over stuff

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.

Alarge new diamond mine has just opened and the price of diamonds has gone down since she has study economics is cecilia decides to buy diamond necklace and she knows that

Can someone me with these 2 questions? and tell me why it is the correct answer?