Many phylogenic trees can be calibrated in time based on:

Name: Many phylogenic trees can be calibrated in time based on:
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Phylogenic trees can be calibrated in time based on the fossil and/or geological record. By comparing the fossils found in different layers of rock, scientists can determine the relative ages of those fossils and create a time scale. This allows them to place the different branches of a phylogenic tree into a temporal context.

Many Phylogenic Trees Can Be Calibrated in Time Based On