समान विशिष्ट जलवायु परिस्थितियों में एक साथ रहने वाले प्रमुख पादप और जंतु समुदायों की विशेषता वाले एक बड़े क्षेत्रीय तंत्र को ________ के रूप में जाना जाता है।

The 'Drain of Wealth' theory was propounded by which Indian nationalist leader?

Which event is considered the turning point in Mahatma Gandhi's leadership in the Indian independence movement?

Which African leader is known for his non-violent opposition to colonial rule?