The ancients developed city-states because O A. the geography made it difficult to organize a unified country
OB. the mountains protected Greek cities from invaders
O C. each city had its own unique culture and religion
OD. it was easy to build cities on small Mediterranean islands

the correct answer is d

a conference committee is a group of congress representatives appointed by the senate and the house to reach an agreement over a bill that had different versions in each chamber. this is due to the fact that, to pass a law. both the house and the senate must agree on the exact same content and wording of the bill to present it to the president.