Answer:
The answers are given below
1. a powerful and centralized government
2. The growth of large cities
3.The development of written language.
Explanation: These three characteristics are very important to consider a true civilization. Because a powerful government indicates the implement of rules and equality of law which is a key factor for a civilization. The large cities of a civilization indicates the life style of a civilization.
language in one of the main element of a civilization. But the development of the written language is more important to a civilization as it describes cultural value of the civilization.
