Give me this answer ​

The value of the next best alternative given up is called ?

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.

Plz me asap! and plz put a real answer! which of the following best describes richard russell's contribution to the war effort? by serving on the senate's naval affairs committee, he investigators learn how the pearl harbor attack was carried out. by to establish military bases like georgia's fort benning, he the state become an important resource to the federal government. by traveling to the war's regions, he develop maps of europe and the pacific. by working with his state's shipyards, he was able to obtain federal contracts to supply the military with ships built in savannah and brunswick.