• powerstruggle@sh.itjust.works
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    21 days ago

    Right, “equivalent to” in the sense that legs are “equivalent to” fins in that they provide locomotion.

    • halcyoncmdr@lemmy.world
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      21 days ago

      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.