According to the theory that terrestrial mammals are the ancestors of whales, extant whales or closely related terrestrial mammals should exhibit.
What proof is there that whales descended from land-dwelling mammals. The femur bone, a remnant component still found in whales, lends credence to the idea that whales descended from land-dwelling mammals. Answer and justification Peter and Rosemary kept track of the variations in each finch species' beak size and shape. Natural selection for the food supply is to blame for the size variance. The human appendix, a snake's pelvic bone, and flightless birds' wings are a few examples of vestiges. Natural selection, wherein organisms adjust to its environments with human interference, is the reverse of artificial selection and is referred to as artificial since it entails human involvement. There are numerous indicators when examining a whale's biology and body.
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