You are presented with the question "what remains are changed into natural gas by heat and pressure change?" and the following answer choices: 
- oxygen
 - dinosaurs
 - bacteria
 - skull
 - clouds
 - humans
 - fossil fuels
 - sea squirts

Now knowing that heat and pressure change the remains of prehistoric living things into natural gas and dinosaurs and Other Prehistoric Creatures Dinosaurs are just one group of prehistoric animals, choose the best answer.


 

  dinosaurs       