Scientists have learned the full extent of viral abundance on earth because
A. a wide variety of microbes is available to act as hosts for these viruses.
B. metagenomic sequencing has identified viruses in a broad variety of environments.
C. the final step of the viral life cycle, release of mature viruses and cell lysis, releases millions of viruses.
D. viruses are known to grow on all life forms: animal, plant, fungi, and bacteria.
Answer: B
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a. Triassic b. Silurian c. Devonian d. Permian e. Cambrian
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