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What is a virus, particularly a marine virus? Definition and life cycle Diversity and study methods Microdiversity Are viruses abundant in the ocean? Are ocean sediments a reservoir of viruses? In the deep sea Oxygen minimum zones Viruses that fly under the radar Are all marine organisms affected by viruses? Viruses of what? The example of the ocean abyss Virus resistance What roles do viruses play in marine ecosystems? Viruses as drivers of genetic diversity Marine viruses: fearsome predators Role of viruses in microbiota Marine viruses and biogeochemical cycles Viral response to the impacts of climate change A brief summary Why study marine viruses? Real-world applications Phage therapy, a future-ready solution already in use Biotechnological potential of microalgae viruses What major questions remain unanswered? Are viruses alive? Can they be placed in the tree of life? Why do we find viruses that have no hosts? Can marine (aquatic) viruses be dangerous for humans? Are viruses good for their hosts? Conclusion Learn more (short bibliography) Acknowledgments About the authors

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