Which value(s)would be required to calculate how long ago the most recent ancestor of ungulates lived?

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All of the values are required to calculate how long ago the most recent ancestor of ungulates lived. The number of base pairs that differ among species in a certain genetic sequence can be used to estimate the amount of time that has passed since the species diverged from a common ancestor. The total number of base pairs in the genetic sequence examined can be used to calibrate the molecular clock, which is used to estimate the rate of genetic change. The age of a fossil ancestor for calibration can be used to provide a fixed point in time that can be used to calibrate the molecular clock.

Which Value(s)would Be Required to Calculate How Long Ago the Most