• NotASharkInAManSuit@lemmy.world
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    1 day ago

    How many animals have we ground up and put through a sieve into salt water to be this confident about it being the only animal that can do this? I need sources.

  • Korhaka@sopuli.xyz
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    1 day ago

    What if you cut it in half first, would the ground up halves restore to half a sponge?

    Then what if you stir the sponge powder and remove half.

    • MajorasTerribleFate@lemmy.zip
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      1 day ago

      So, my assumption is: separated cells with the same genetic code, or some other biomarker of “individuality” that might not technically be unique, will attach to each other given the chance.

      Super quick research suggests they don’t have organs or a nervous system, but do have specialized bits like flagella to move water through their pores/tunnels. The majority of the cells just … are. Sounds more like a colony of genetically identical cells than a single multi-cellular creature (to me), but I assume biologists have much more information and reason to consider them the way they do.

      • Korhaka@sopuli.xyz
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        16 hours ago

        So could we clone them and then grow them larger again, then once they regrow combine them into a super sponge!

        • MajorasTerribleFate@lemmy.zip
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          8 hours ago

          I dug around for a little bit, and it seems like the answer might be yes. Take what follows with a grain of salt, as I skimmed or read a few sources focused on different things and have done my best to reproduce a full picture.

          First, some basic facts. Sponges anchor to the seabed (freshwater ones anchor to the dirt at the bottom of a lake/whatever). Sponge cells can move around each other and rearrange, part of their normal functioning, to keep water flowing through themselves efficiently for respiration and food capture.

          Next, the mechanisms of reconstruction from a soup of sponge cells. As they bump into each other and recognize their own kind, sponge cells manage to hold together and hope for ground to attach to. They flatten out, presumably both to improve grip to the ground and to provide a large surface area for more cells to join. As long as the new colony ends up with enough of two specific kinds of cells (one makes connective mesohyl, the other makes everything else), it can grow.

          The main thing I couldn’t (quickly) find is specific confirmation that two healthy, stable colonies coming from a single halved source sponge can reattach, or if the reaggregation process only works following injury or during some kind of stress. Since the cells normally move around, though, it seems reasonable that this could work.

          Based on all that and assuming their aren’t other factors for sponge cells recognizing each other not entirely based on DNA, then presumably clones could also be attached.

          Note that sponges don’t actually stop growing. Their main limits are resource needs and predation, since some sea life likes to take nibbles or bites out of them (that’s possibly a factor to why they are so adept at reorganization). So if your question involved cloning (rather than reattachment) only to get around a rough maximum size or early-life growth period that stops, it shouldn’t be necessary.

  • s@piefed.world
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    2 days ago

    If you mix up the grindings of multiple sponges, do they only recombine with their own cells?

  • danhab99@programming.dev
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    2 days ago

    There seem to be many of these multicellular animals who don’t feel like a singular individual animal. I was commenting on a post a few months ago about the most genetically simple multicellular animal, this thing has less base pairs than most bacteria, and it can also do this trick where disassociated cells recombine into new individuals. This creature also reproduce sexually if and only if the concentration of fellow individuals is high enough, cells will just leave the body and join a new one like for fun. It really calls into question what an individual is.

    • very_well_lost@lemmy.world
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      2 days ago

      I guess it makes sense that multicellularity would be more of a spectrum than a binary condition. If life evolved into it gradually, then it would make sense to find a lot of “intermediate” evolutionary states that don’t feel like they’re distinctly one or the other.