• Ada@piefed.blahaj.zone
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    1 个月前

    The opening line of that wikipedia article says they’re “equivalent to sexes in multicellular lifeforms”

      • halcyoncmdr@lemmy.world
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        1 个月前

        I mean, they are just for different environments. Fins aren’t very useful for terrestrial animals, and legs aren’t as useful for aquatic animals. Both provide similar functions suited to their environment, and are therefore roughly equivalent.