please help this is very important i will give you brain thing if its correct and no links pwease <3

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.

12 there are four phases of self-regulation: forethought, performance, self-reflection, and punishment. select the best answer from the choices provided ot of

What type of government does botswana have? a. communist b. democratic c. fascist d. socialist