Sharks, whales, and dolphins share similar features such as body shape and the position of fins. However, sharks have gills for breathing, while whales and dolphins have lungs. Sharks and dolphins are similar in construction because they need their parts to complete many of same functions.
For example:
The dorsal fins that are found in both shark and dolphin are due to convergent evolution and they are actually not from common ancestor.
Sharks are a part of the elasmobranch family, which incorporates sharks, rays, skates, and sawfish, at the same time dolphins, are a part of the cetacean family, which incorporates toothed and baleen whales, in addition to porpoises.
Streamlined our bodies and fins offer a huge gain for them, permitting them to swim faster. We recognize that dolphins and sharks aren't carefully related and that they did not inherit their comparable frame shapes from a not unusual place ancestor. Their streamlined bodies, dorsal fins, and flippers are the end result of convergent evolution.
Both sharks and dolphins commonly have what's known as countershading in which their bellies are lighter than their backs, which is a beneficial manner to combo into the marine environment. Dolphins and sharks each have dorsal fins on their backs, pectoral fins on their sides, and a tail.
Therefore it is clear that it shares a common ancestor.
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