They have a single common currency & they allow people to move easily between the countries
Answer:
d. scale up representations of objects in space
Explanation:
The models of the solar system are most commonly used for scaling up representations of the objects in space. These models give nice and simple representation of the objects that are in close proximity to Earth, thus providing us with some basic knowledge about their size, distance from the Sun and each other, their orbits, and if the moons are included, than information about them as well. The scaling up manages to help us understand just how small our planet is when compared to other objects, and how much smaller we are in comparison to it all.
Yea it would cost a lot of money haha
