The country of Thorntown has a population of 50,000 people and covers 5,000 square miles. Last year, there were 109,000 new children born and 111,000 people died.

According to the article about the zhou dynasty, this dynasty was broken into different eras because its capital changed from place to place. how many different eras were there in the zhou dynasty? a. two b. six c. ten d. fourteen