Fact 1: Heat can change the state of matter. Fact 2: Plasma, the fourth state of matter, can be created on earth by supplying sufficient heat. Given the two facts above, what is plasma created with?
OPTIONS:
1). heat.
2). Urea.
3). Gases.
4). oxygen.
5). energy.
6). a star.
7). immune.
8). cells.
1).