पारिस्थितिक पदानुक्रम में, समान जलवायु, पर्यावरणीय स्थितियों और पौधों एवं जानवरों के समुदायों की विशेषता वाले बड़े भौगोलिक क्षेत्रों को किस शब्द से पहचाना 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?