मानव भ्रूणविज्ञान (human embryology) के दौरान, बढ़ते भ्रूण में सबसे पहले किस अंग प्रणाली का विकास होता है और वह कार्यात्मक रूप से सक्रिय होती 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?