It demonstrated that bin Laden and al-Qaeda were not intimidated by the United States' reprisal for their terrorist acts.
There are no sentences??!!
They searched for El Dorado one of the infamous cities in the andes.
The right answer for the question that is being asked and shown above is that: "to reveal the contributions of ancient civilizations." You are an anthropologist that takes knowledge of present societies and compares them with ancient ones. One reason why you study history is <span>to reveal the contributions of ancient civilizations</span>