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First, there was a selection for an increase in size by becoming multicellular, and once achieved there was a selection for better integration, a better coordination of the adhering cells to compete effectively for energy and for a way to reproduce successfully. Then, which each successive step of size increase, propelled always by the fact the uppermost size niche is never filled, there has been a further selection pressure for integration and coordination, often by new and innovative devices to accommodate the newly created larger organism. (en) |
