"Wallace's line," which serves as a dividing line between different biogeographic realms and separates several present-day Indonesian islands from one another, is so named to show the arbitrary nature of such delineations.

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Wallace's Line is named after Alfred Russel Wallace, who identified it as a faunal boundary separating the ecozones of Asia and Wallacea, highlighting significant differences in species distribution due to historical geological and evolutionary factors, not to indicate arbitrariness.

"Wallace's Line," Which Serves as a Dividing Line Between Different