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Immune System and Foreign Invaders : Bacteria and Viruses

Immune System

Immune System and Foreign Invaders Evolutionary origin of bacteria and viruses Earth formed between 4.5 and 6 billion years ago. Conditions initially remained inhospitable for the potential development of life. By about 3.0 billion years ago, however, an atmosphere that contained the appropriate blend of nitrogen, oxygen, carbon, and hydrogen allowed …

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