Final answer:
A common political culture is not necessarily a shared quality among civilizations; they can have diverse political ideologies and goals.
Step-by-step explanation:
According to the host, a shared quality that is NOT necessarily a feature of civilizations is participants sharing a common political culture. The text emphasizes that while civilizations have various characteristics, such as social development, sustainable farming/harvesting, access to water, organized government, and an enlightened culture, there is no strict requirement for a unified political ideology. Additionally, civilizations also do not require a consensus on what their goals should be, hence indicating that political and goal-related diversity can exist within a civilization.