You are presented with the question "you can determine the growth rate of the forest by examining what?" and the following answer choices: 
- seasons
 - tissue
 - bark color
 - cycles
 - alleles
 - radiation level
 - rings
 - color gradient

Now knowing that the number of rings in a tree trunk can be used to estimate the age of the tree and tree rings are examined to learn the forest age and growth rate, choose the best answer.


 

       rings  