“Sharks and dolphins are extremely similar in many ways, but are very far apart on the tree of life.” Are they very far apart? It’s true that dolphins are mammals, and are more closely related to humans than they (or we) are related to sharks. On the other hand, sharks and dolphins are both chordata, and are closer to each other on the tree of life than either group is to the lobsters, or the jellyfish, or mushrooms, or petunias or …

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