To make a case for or against a trend in the evolution of complexity in biological evolution. complexity needs to be both rigorously defined and measurable. A recent information-theoretic (but intu- itively evident) definition identifies genomic complexity with the amount of information a sequence stores about its environment. We investigate the evolution of genomic complexity in populations of digital organisms and monitor in detail the evolutionary tran- sitions that increase complexity. We show that, because natural selection forces genomes to behave as a natural "Maxwell De- mon," within a fixed environment. genomic complexity is forced to increase.
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