We are aware that sharks and dolphins are not closely related, and that their comparable body types were not inherited from a common ancestor. Their dorsal fins, flippers, and sleek bodies are the consequence of convergent evolution.
Sharks and dolphins as a whole species are two further examples of comparable structures. Sharks and dolphins are physically and physiologically quite different, although they have evolved to have comparable functions. Sharks and dolphins both have bodies that are streamlined for aquatic environments and use their fins to swim.
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