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That parallel evolution creates the illusion that the two lineages are closely related.

The other scenario, Rutherford explained, is that omicron had a "parallel evolution track" — from infecting animals from a human and then back to humans — that could have caused all of its mutations.

Braun says that the data can be used to better understand everything from the parallel evolution of flightlessness in ratites like emus and kiwis to the evolution of vision and song learning in birds overall.

Strikingly, half of the changes were shared by the rabbits in all three countries—evidence of parallel evolution.

But in contrast to the parallel evolution in rabbits, myxoma viruses in the various locations took different genetic paths to regaining potency.