You are presented with the question "what gets changed into natural gas due to heat and pressure?" and the following answer choices: 
- mussels
 - oxygen
 - glass
 - clams
 - animals
 - Most plants
 - temperature
 - dinosaurs

Now knowing that heat and pressure change the remains of prehistoric living things into natural gas and evidence of prehistoric life includes many dinosaur footprints found in coal mines, choose the best answer.


 

        dinosaurs 