Backfilling is the right one
I would say Afghanistan or maybe North Korea
A line segment on a graph would be any line that isn't continuous. It would have dots on the ends instead of arrows. Is that what you're asking?
Answer:
The physical features determine weather or not you can trade with a certain country
Explanation:
If a country is surrounded by water, then it makes it easy to trade with other countries, positively impacting the economy, but if it is surrounded by mountains, then it is a lot harder to trade with.
