Could SARS-CoV-2 have evolved from another coronavirus by mutation and natural selection? I don’t see why not, though there is only indirect evidence (from DNA sequences) to support the idea. If it had happened, however, it would not provide support for Darwinian evolution. First, viruses are not living organisms: They are just pieces of DNA or RNA enclosed in a protein coat. They do not carry out metabolism (the chemical processes that are essential for life), and they do not reproduce themselves (only living cells — or skilled genetic engineers — can make copies of them). Second, even if viruses were considered living things, the evolution of SARS-CoV-2 from another coronavirus would be akin to microevolution — minor changes within existing biological species. (“Species” are not even defined the same way in viruses as they are in living organisms.)But Darwin did not write a book titled How Existing Species Change Over Time. He wrote a book titled The Origin of Species. In other words, Darwin attempted to explain macroevolution — the origin of new species, organs, and body plans.