How and why did evolution change the shape of the vertebrae in different species of frogs, and at the same time "covered" all traces of transformation?

   
How and why did evolution change the shape of the vertebrae in different species of frogs, and at the same time covered all traces of transformation? - Paleontology, Biology, Research, The science, Evolution, Charles Darwin, Natural selection, Mystery, Interesting, Zoology, Amphibians, Spine, Darwin's theory, Nauchpop, Informative, Scientists, Nature, A fish, Experiment, Frogs

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