I need help with these questions

Why was the battle of gaugamela an important turning point in alexanders conquest of persians empire

Why did siddhartha gautama leave home at age 30? a. to find answers to his questions about human life b. to establish a religion that was better than hinduism c. to those who felt pain and suffering in life d. to spread his new religious ideas to other people

During its history, france has been a kingdom, an empire, a colonial power and a republic. true or false