Just one of many sources of evidence for common descent. Even more impressive, broken genes in related taxa are broken in the same way, indicating common descent. And we can test this by looking at the genomes of organisms of known descent.
The likelihoods would be greater than shuffling a deck of cards and getting the exact same order twice. That's 1/52!, an astonishingly huge number. I've had creationists say that God did it deliberately to test our faith. But that requires that God be deceptive. Which no Christian would accept. It's not just broken genes, it's telomere remnants in places where a fusion would have to occur if common descent was true, and viral remnants inserted in precisely the same places by chance. Just too unlikely to consider seriously.
The first tests were DNA hybridization that measured all of the DNA. Those simple tests gave us pretty much what sequencing only coding DNA gives us. The precise similarities differ, but the numbers always give the same phylogenies. (Barbarian checks)
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One of the first by Fitch and Margoliash
And it's not just DNA. Highly-conserved molecules also give us very similar results:
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Summarize one or more of the arguments therein that you think are solid ones. We'll discuss them. I'm assuming you understand them well enough to tell us about them. If not, why do you think they are good arguments?