Select the correct answer. Based on the law of conservation of energy, which statement is false?
Α.Energy is lost when machines don't work right.
B. We can't add more energy to the universe.
C. We can't destroy energy that exists in the universe.
D. Energy changes from one form to another.

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.

22. the effect of threshold braking is to a. cause skids. b. lock wheels. c. prevent locking of wheels. d. increase stopping distance.

How did presidential reconstruction allow black codes to be passed