जिन जंतुओं में रीढ़ की हड्डी या कशेरुक दंड (vertebral column) होता है, उन्हें किस प्रमुख समूह में वर्गीकृत किया जाता है?

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?