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, answer the question "what is plasma created with?" with the following options: 
- heat
 - Urea
 - Gases
 - oxygen
 - energy
 - a star
 - immune
 - cells


 

 heat        