Explanation:
Citizens participated in the government by voting in the General Assembly. Explanation: All Athenians participated in Athens's democracy by giving their votes to choose or to replace the present government. Athens became one of the powerful cities in Greece during the Classical period.
Independet city-states mostly developed because either:
a - some of the city-states were isolated because they were islands
This is a good reason why a city-state can develop - as it's physically siolated
c - the mountains separated groups of people from one another.
d - people also depended on navigable rivers for travel and communication
The last one perhaps applying a bit less.