निम्नलिखित वैज्ञानिकों में से किसने सबसे पहले पारिस्थितिक पिरामिड (ecological pyramid) की संकल्पना प्रस्तुत की थी?

The Dandi March, also known as the Salt Satyagraha, was led by which influential leader?

Which act formally granted independence to India, marking the end of British rule?

Who was the key figure in establishing the Indian National Congress?