"...in their 2002 book Acquiring Genomes: A Theory of the Origins of Species, Margulis and Dorion Sagan maintain that combining random mutations with natural selection at best explains changes of form only within existing species (more black moths and fewer white). Though the new synthesis continues to generate sophisticated science, Margulis insists that it does not properly account for the appearance of new species. She contends that we must look to symbiosis to understand this critical aspect of evolution."
http://bostonreview.net/wonders/anne-fausto-sterling-evolution-symbiogenesis
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