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Dolphins, like all other life, are entirely formed by natural selection. There's not a single part of them that hasn't been touched, over the course of their evolutionary history, reaching back to the first cellular lifeforms, by natural selection: from their overall shape and colour to the metabolic pathways in their cells.

One of the most apparent adaptations of dolphins, relative to other (land-dwelling) mammals, but not unique to dolphins alone, is the adaptation of their morphology and physiology to a completely aquatic existence.

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11y ago

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