कथन (A): जनसंख्या वृद्धि ऋणात्मक हो सकती है। कारण (R): मृत्यु दर जन्म दर से अधिक हो सकती 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?