How do archeologists add to our knowledge of history ?

An archeologist is one who studies past civilizations and ancient cultures by digging up remains, locating artifacts and exploring ruins of buildings. So, what archeologists do is they form theories about cultures of ancient people. In this way, archeologists add our knowledge of the history.

Ithink its c) the conditions in the factory have never been questioned by the employee.

Aztec and hopi that was the main property