The five characteristics of civilization are:
1. Advanced cities: this is a large number of people living together and interacting with one another in term of trade and in other ways.
2. Specialized workers: people in the population are specialized in different specific fields that are important to the people at large.
3. Complex institution: there is organization in the community which is long lasting in nature.
4. Record keeping: Means of documenting important events and important information are in place.
5. Advanced technology: the people have invented means of solving emerging problems in the community.
The most important characteristic is the advanced cities. This is the foundation of civilization and without it no civilization can occur.
Banded iron formations occur in Proterozoic rocks, ranging in age from 1.8 to 2.5 billion years old. They are composed of alternating layers of iron-rich material (commonly magnetite) and silica.
Answer:
C. The number of immigrants from southern and eastern Europe more than doubled.
Archeologist learn about the past examining and studying new artifacts they find. They calculate how old a a certain artifact is, and make conclusions based on the time and period it was used, it can help add to the history of humanity.