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Well, as an example, domesticated dogs share an ancestry with gray wolves. The gray wolf is the species Canis lupus. However, the domestic dog would be the subspecies Canis lupus familiaris. The breeds within that classification would simply be grouped together under it.
And viruses are classified the same way as other biological entities, right down to the species. For example, the influenza virus is from the family Orthomyxoviridae. Then you get the genus Influenzavirus A, species Influenza A virus, and ultimately a subspecies such as N1H1.
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Knowing that death is certain and that the time of death is uncertain, what's the most important thing?
—Bhikkhuni Pema Chödrön
Humankind cannot bear very much reality.
—From "Burnt Norton," Four Quartets (1936), T. S. Eliot
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