The number of rings in a tree trunk can be used to estimate the age of the tree.
Dendrochronologist: a person who studies tree ring growth.
Estimating the age of trees is done by dendrochronologists.
dendrochronologists do what with regards to tree age?
Options:
(1) lie about age
(2) support
(3) observe it
(4) estimate age
(5) begin age
(6) focusing a lens
(7) reinforce age
(8) genetic diversity