Scientists Have Learned the Full Extent of Viral Abundance on Earth

Multiple Choice

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

A) the final step of the viral life cycle, release of mature viruses and cell lysis, releases millions of viruses.
B) metagenomic sequencing has identified viruses in a broad variety of environments.
C) a wide variety of microbes is available to act as hosts for these viruses.
D) viruses are known to grow on all life forms: animal, plant, fungi, and bacteria.