By looking at changes in the DNA (deoxyribonucleic acid, the code that makes up genes) of 122 species of cypress, the researchers were able to reconstruct a timeline for their evolution. They also included fossil evidence in the analysis.
The most recently evolved subfamilies of cypress, Cupressoideae and Callitroideae, split from each other about 153 million years ago, as the two remnants of Pangaea
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