Final answer:
In early Greek city-states, the polis was the political unit centering on a city and its surrounding lands. The Acropolis was a fortified area on a hill used for protection, while the Agora was an open area for gathering and discussion.
Step-by-step explanation:
In early Greek city-states, the term 'polis' referred to a political unit centered on a city and including the surrounding lands. It was the center of Greek politics in each city-state. The Acropolis, meaning 'high city,' was typically located on a hill and served as a fortified area where inhabitants could seek safety in times of danger. The Agora was an open area used as a market and a public square where citizens gathered to discuss important matters related to the polis.