While we can use molecular clocks based on molecular sequence data to estimate the times at which various lineages diverged, we ultimately need the to calibrate the clocks.

A) morphology
B) fossil record
C) radiometric data
D) B and C
E) All of the answer options are correct.

B) fossil record

Explanation:

From the fossil records the scientists were capable of calibration of the divergence rates of the nucleotide sequences that is important to known the divergence of lineages from a common ancestor. The fossil records are necessary for the testing various hypothesis. In the absence of the adequate fossil record, the geological events can be used to calibrate the molecular clocks.

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oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%