जनगणना के आंकड़ों के अनुसार, कौन सा अनुसूचित जाति समूह उत्तर प्रदेश की कुल अनुसूचित जाति जनसंख्या का सबसे बड़ा हिस्सा (50% से अधिक) 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?