You are presented with the question "In order to survive, animals require what?" and the following answer choices: 
- food and shelter
 - light energy
 - securing a loan
 - cashing their checks
 - Organic compounds
 - hydration of their cells
 - eating their enemies
 - Chemical energy

Now knowing that animals require water for survival and water hydrates the cells, choose the best answer.


 

      hydration of their cells   