You are presented with the question "What two things turn fossils to natural gas?" and the following answer choices: 
- heat and cold
 - heat and fuel
 - hydrogen and oxygen
 - heat and pressure
 - pressure and time
 - scarce resources
 - kinetic energy
 - chemical changes

Now knowing that heat and pressure change the remains of prehistoric living things into natural gas and fossils are the remains of prehistoric life, choose the best answer.


 

    heat and pressure     