Fact 1: The number of rings in a tree trunk can be used to estimate the age of the tree.

Fact 2: Dendrochronologist: A person who studies tree ring growth.

Given the two facts above, answer the question "dendrochronologists do what with regards to tree age?" with the following options: 
- lie about age
 - support
 - observe it
 - estimate age
 - begin age
 - focusing a lens
 - reinforce age
 - genetic diversity


 

    estimate age     