For 10 points, name this lowest-level biological taxon, the "Origin" of which was investigated by Darwin.
One type of these groups, which was theorized by Robert Paine, is defined by a large environmental impact for its body mass. One way in which new ones are generated was theorized by Ernst Mayr in a book about "Systematics" and the origin of these groups, which Dobzhansky defined genetically. They are created in peripatric, allopatric, and sympatric processes. In the Linnean scheme, this term makes up the second half of binomial nomenclature, after the genus. For 10 points, name this lowest-level biological taxon, the "Origin" of which was investigated by Darwin.
One type of these groups, which was theorized by Robert Paine, is defined by a large environmental impact for its body mass.
species [or word forms like speciation]