Hi,
c:operational
2 countries next to each other disagree on a major issue involving the border ex: Mexico and the US disagree over how to handle illegal immigration
The answer is Brazil I think
Answer:
part of Oceania sub-region known as australasja Oceania was replaced by the concept of Australia as a continent in the 1950s
I believe it is D. International date line, because the question holds the answer. When you say "Different days" it kind of gives the answer away.
Hope this helps :)