"In my opinion, an effective marketing team is made up of people with diverse skillsets and varying levels of experience. I like to know that I can learn from my colleagues and that I will also have the opportunity to teach my skills to someone else. I think this encourages an organic flow of ideas."

First, acknowledge that there are many ways for a marketing team to work effectively and succeed. If you have been part of a talented marketing team, explain what made your experience enjoyable and what made the team effective as a whole. If you haven't been part of a great team, you can simply share your opinion on what makes a team successful. Hint: Look to the job ad for clues about what the company's marketing team is like, and develop your answer based on that.