Why do people say an "explanation" is evidence? doesn't the selection of explanations require and necesitate evidence?

quote "the bone structure of forelimbs of whales, humans, birds, and dog... the pattern of bones is very similar." how can we explain the similarities?

"It's less likely that such similar structures would have evolved independently in each species, and more likely that the basic layout of bones was already present in a common ancestor of whales, humans, dogs, and birds." this explains the feature, selecting between two presumptions of evolution as interpretation but is not evidence of a common ancestor. yet is listed as evidence of evolution?

contrast a non evolution (because both were evolution above) explanation, "it is more likely that the creator preffered that bone structure for many species" would that "explanation" be evidence of a creator?

Updates
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dogs have 78 chromosomes therefore dog "ancestor" MUST have 78 and not the common ancestor of humans which must have had 46 chromosomes reproducing 23 each, like lima beans.
Why do people say an "explanation" is evidence? doesn't the selection of explanations require and necesitate evidence?
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