Around the time of the first bacteria, about 3.2 billion years ago and after LUCA, the Duplodnaviria evolved a high-pressure, icosahedral protein armor that turned viruses into biological syringes capable of injecting DNA into any domain of life.
The definition of life is not absolute; it is a human classification built around a cluster of biological properties such as metabolism, reproduction, and evolution.
Viruses
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