What does the word renaissance refer to?

Which is the most accurate description of the executive office of the president? groups of advisers who the chief of staff groups of advisers who the president groups of advisers who oversee national security groups of advisers who oversee the economy

Why was florance consterd the heart of the renassinance

How and to what extent did the enlightenment thinkers challenge social and political aspect of the world in the 1700s?