खाद्य श्रृंखला (food chain) में मनुष्य मुख्य रूप से क्या भूमिका निभाते हैं?

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?