भारत की जनगणना में, एक 'मुख्य श्रमिक' (Main Worker) को उस व्यक्ति के रूप में परिभाषित किया जाता है जो काम करता है:

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?