Making an exact copy or reproduction of something, or (in biology) when molecules like DNA make copies of themselves.
From Latin 'replicare' combining 're-' (again) and 'plicare' (to fold). Originally meant to fold back; evolved to mean to repeat or copy.
DNA replication is one of nature's most incredible achievements—it copies 3 billion letters of genetic code with only about 1 error per billion, yet somehow we still evolved mutations that drove evolution!
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