Dolphins (which are mammals) and sharks (which are fish) have stiff dorsal fins projecting from their backs that help them maneuver through water. These relationships of structures to each other are best described as

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Analogous structures are structures that have similar functions but different evolutionary origins. In this case, the dorsal fins of dolphins and sharks both help them maneuver through water, but they have different evolutionary origins.

Dolphins (Which Are Mammals) and Sharks (Which Are Fish) Have