You are presented with the question "What can cause objects to change shape?" and the following answer choices: 
- Pulleys
 - a prism
 - Machines
 - Heat energy
 - Animals
 - mechanical
 - Lifts
 - Temperature

Now knowing that folding an object causes that object to change shape and tri-folds and half folds are acceptable if machine folded, choose the best answer.


 

   Machines      