Answer: Rome's navy no longer had enough ships to control the Mediterranean Sea. The Roman army grew in size and became dominant in the Mediterranean region.
The best choice is, <u><em>Rome limited its soldiers to six months of service each year.</em></u>
<span>The main way in which their settlements differed was that the Chavin settled the highlands while the Nazca settled the valleys, which led to different farming techniques. </span>
