Because viruses survive off of the host cell. The correct answer is D.
What is viruses?
A virus is a very small microorganism that cannot be seen with the bare eye or by light microscopy. The typical size of a virus is 20 nm to 300 nm. Viruses multiply inside the living cells of the host in which they reside. These hosts primarily comprise animals, plants and bacteria. A virus is surrounded by a protein coat and a DNA or a RNA core as its genetic material.
Bacteroides thetaiotaomicron is a bacterium of the genus Bacteroides. It is a gram-negative obligate anaerobe. It is one of the most common bacteria found in human gut microbiota and is also an opportunistic pathogen.
Staphylococcus epidermidis is a Gram-positive bacterium, and one of over 40 species belonging to the Staphylococcus genus. It is part of the normal human flora, typically the skin flora, and less commonly the mucosal flora and also found in marine sponges. It is a facultative anaerobic bacteria.
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