The concept describing a large, interconnected urban region resulting from the merging of major metropolitan areas is known as a Megalopolis. The term was originally introduced by which of the following scholars?

In traditional anthropological classification of human races, which racial group was characterized as 'yellow-skinned'?

What is the approximate estimated proportion of ecumene (habitable) and non-ecumene (uninhabitable/sparsely inhabited) areas on the Earth's surface?