You are presented with the question "Bears are proportionally weighted on a balance for discovering what?" and the following answer choices: 
- size
 - traits
 - mass
 - age
 - energy
 - forces
 - SNPs
 - shape

Now knowing that abalance is used for measuring mass of an object and bears are proportionally weighted for use on a balance for measurement discoveries, choose the best answer.


 

   mass      