dendrochronology is a method of dating by using\ntree rings.\nradiocarbon.\ncalendar age.\ncorrelated age.

Answer

Brief Explanations:

Dendrochronology is the scientific method of dating based on the analysis of patterns of tree - rings. Each year a tree grows, it adds a new ring to its trunk. By comparing the ring patterns of different trees or wood samples, the age of the wood and associated events can be determined. Radiocarbon is used in radiocarbon dating, calendar age is a general time measure, and correlated age is related to establishing age through correlations with other known age - markers, but they are not what dendrochronology uses.

Answer:

tree rings.