Very interesting read thanx Rodger !
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This type of genome streamlining, researchers say, appears to be a major factor in the evolutionary success of SAR11, which they believe may have been thriving for a billion years or more. One scientific hypothesis holds that natural selection acts to reduce genome size because of the metabolic burden of replicating "junk" DNA with no adaptive value – SAR11 supports that theory
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"By comparison, humans are mostly junk DNA, with large parts of the human genome having no important function," Giovannoni said.
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Is it me or is this contradictory ?