You are presented with the question "What in an egg causes protein to become rough and rubbery?" and the following answer choices: 
- layers of fat
 - stamina
 - coded genes
 - lining
 - Converted sugar
 - chemical reaction
 - shell
 - Chemical energy

Now knowing that heating an egg causes a chemical reaction in the egg and high heat causes the protein in eggs to become tough and rubbery, choose the best answer.


 

      chemical reaction   