How much did the lousiana purchase cost the united states?

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.

Functionalism was a school of psychology that focused attention on the

Which term describes a possible explanation of, or answer to, a scientific question that is based on prior knowledge or research and that is testable?