Yes, if you like. Consider the stromatolite, or trichoplax. It seems to me that the boundary, if any, between "ecosystem" and "organism" is conceptual rather

Yes, if you like. Consider the stromatolite, or trichoplax. It seems to me that the boundary, if any, between "ecosystem" and "organism" is conceptual rather than physical. https://en.wikipedia.org/wiki/Stromatolite https://en.wikipedia.org/wiki/Stromatolite https://en.wikipedia.org/wiki/Trichoplax https://en.wikipedia.org/wiki/Trichoplax