Choose your answer from:
(1). Shape.
(2). Mass.
(3). hair.
(4). fats.
(5). O3.
(6). Density.
(7). Volume.
(8). matter.
Q: Fact 1: Phase changes do not change mass. Fact 2: Melting is a phase change. Given the two facts above, what is not changed by melting?
A:
(2).