How does currency help in economical activities?

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.

What are the roles of students against women violence? explain

99 points and brainliestdiscuss two of the major causes of the increasing pollution levels in the yangtze river. make sure to include how they contribute to the water pollution