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A collection of cells can maintain their individuality, and have almost nothing in common but their location. No doubt all multicellular organisms today are descended from such collections. To start doing anything useful for survival, the cells of such a collection can begin to specialize: some for locomotion, some for digestion, some for protection, and so ...


Sponges are generally considered as colonial organisms because there is little cell specialization and little separation of function/role. All cells do pretty much the same thing; it looks more like a pile of individual cells than an actual multicellular organism. In reality it is a little bit in between. In any case, what one wants to call multicellular or ...


try this one as well: the document with the taxonomy is the taxa.txt document

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