Answer:
Greek civilization developed into independent city-states because Greece's mountains, islands, and peninsulas separated the Greek people from each other and made communication difficult. The steep mountains of the Greek geography also affected the crops and animals that farmers raised in the region.
Step-by-step explanation:
Greece has the longest coastline in Europe and is the southernmost country in Europe. The mainland has rugged mountains, forests, and lakes, but the country is well known for the thousands of islands dotting the blue Aegean Sea to the east, the Mediterranean Sea to the south, and the Ionian Sea to the west.