Scientists have learned the full extent of viral abundance on earth because

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Metagenomic sequencing has allowed scientists to identify viruses in a broad variety of environments, revealing the full extent of viral abundance on Earth. This method involves sequencing samples from a wide range of organisms and environments, allowing the detection of viruses that may not have been previously studied or identified. Additionally, metagenomic sequencing has led to the discovery of many new viruses, indicating that the actual extent of viral diversity is likely much greater than currently known.

Scientists Have Learned the Full Extent of Viral Abundance on Earth