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#151
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Hal- sponges have developed immune systems... this means that while they can reassemble their own parts after injury they are not truly colonial.
A colonial animal (like a choanoflagelate) can loose or gain new members without triggering an immune response. They also don't have differentiated cells like sponges or even placozoans. Sponges have ten different kinds of cells that perform individual functions. Genetic evidence also hints that sponges may be secondarally simple. That is they lost tissues and other 'advanced' features as they simply weren't nessisary for survival. hope this helps. wa:do
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mispellers of the world 'untie'! ![]() wa:do Cherokee for 'thank you'
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#152
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Quote:
However, I didn't say they were truly colonial, but I don't think they're what we could truly class as multi-cellular either. I can't think of another multi-cellular life form that can have it's composition utterly disrupted and then have those same cells independently re-assort themselves, growing new cells to replace lost ones is one thing, but having dislodged cells re-position themselves on their own is something else. So, I can see what Tau is driving at, but agree with you that they belong in Animalia, especially if as you say they are secondarily simple.
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#153
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why not?
We do the same thing to a lesser extent when we repair damage. We can reattach lost fingers and so on. (thankfully or I would be missing the top of my left thumb.) They can just do it better as they don't have to worry about specialized tissues to get in the way. And truth be told, not all sponges can do this feat. A few of the most basal forms can. And this in under laboratory conditions... not the sort of experience one would find in the wild. Also Placozoans can do it as well. I'm not sure if anyone has tried with Cniderians. wa:do
__________________
mispellers of the world 'untie'! ![]() wa:do Cherokee for 'thank you'
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#154
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Quote:
You couldn't put your thumb in a blender and hope to have it fuse back together afterwards.
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#155
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no I dont, but then its specalized tissue... that a sponge doesnt have.
However my cells do reattach themselves (if the trauma isnt significant) Scar tissue is cells moving into or growing into the area. even most sponges cant put themselves back together. ![]() its a very neat trick. wa:do
__________________
mispellers of the world 'untie'! ![]() wa:do Cherokee for 'thank you'
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#156
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Frankly I don't care what you think...psuedo biologist. Last edited by Tau; 05-17-2008 at 12:14 PM. |
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#157
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I think you need to go back and check your Kingdoms.
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#158
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Single celled animals exist.
No check necessary, taxonomy is a fluid science, not set in stone, later gator. |
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#159
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