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" ... But it wasn't through multicellularity alone that modern animal life became possible. Eukaryotes require more time and resources to develop to maturity than prokaryotes do, and multicellular eukaryotes have an even greater timespan from generation to generation. Complexity faces an enormous barrier: the simpler organisms they're competing with can change and adapt more quickly. ... "
" ... Wellman continues: "The origins of complex multicellularity and the origin of animals are considered two of the most important events in the history of life on Earth, our discovery sheds new light on both of these. We have found a primitive spherical organism made up of an arrangement of two distinct cell types, the first step towards a complex multicellular structure, something which has never been described before in the fossil record." To work together, individual cells must form contact surfaces with neighboring cells. The fossil shows such Y-shaped junctions, suggesting the cells communicated together exchanging chemicals. ... "