'एक प्रजाति का अर्थ एक नस्ल है, संस्कृति नहीं।' निम्नलिखित मानवविज्ञानियों में से किसने यह कथन कहा था?

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?