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Chapter category: Evolution

Thoughts on Multi-Cellularity: How Nature got Around Darwin

Chapter authors:
Christian Schwabe

Reproductive success is the ultimate criterion for survival in the Darwinian paradigm, and since micro-organisms are undisputed champions of reproduction the countless creatures that condensed in the shallow Cambrian waters simply drained the old model of credibility. Every living shape appearing at once, crawling, swimming or slithering away from the line that separated the microbial world from the age of large, short-lived creatures, was testimony to an unstoppable drive to complexity with merely adequate reproductive levels. How did nature get around Darwin? The answer may seem extensive but I simply do not know enough to make it short.

The sharp line between the animate and the inanimate world and the speed of transition reflects the powerful force of atomic structure. It took about 6 times as long (3 billion years) to produce macro-organisms from single cellular life than it did to produce life. Most students of evolution find this quite surprising because, at the level of biological processes, it would seem easier to produce a large animal from a cell than to produce a living cell from elements. In the chapter on the origin of structure this observation is explained by the logarithmic increase in the number of connections required with every additional layer of complexity.

Animals appeared in the Ediacaran, slightly ahead of the Cambrian but most of them were soft-bodied and did not survive except the jelly fish. The first 10 million years of the Cambrian, now known as the Tommotian, brought about a bewildering array of micro-fossils, none larger than a few millimeters. A quote from Stanley’s text is illuminating in that context.1

"Also found in Tommotian rocks, however, is a host of strange skeletal elements that cannot be assigned to any living phylum and that seem to be unrelated to any group of fossils found in rocks younger than Cambrian age.

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