श्रीलंका का कौन सा स्वदेशी अल्पसंख्यक समूह ऐतिहासिक रूप से शिकार और भोजन जुटाने से जुड़ा 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?