निम्नलिखित वैज्ञानिकों में से किसने जैविक विकास को 'संशोधन के साथ अवरोहण' (descent with modification) के रूप में परिभाषित किया?

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?