Answer:
They cannot reproduce themselves outside a host
Step-by-step explanation:
The viruses and bacteria are the microscopic organisms that can be differentiated on many bases but among these features, a feature that is unique to viruses and not present in bacteria is that the viruses cannot replicate and reproduce without the host organisms.
The bacteria reproduce by the binary fission type of asexual reproduction whereas the viruses lack the machinery to divide and require the replication machinery of the host cells.
Thus, the selected option is correct.