<span>B. maintain a balance of power.
The alliances among nations in Europe was established to maintain a balance of power in the region.
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<span>Models can be very helpful in describing the different arrangements of atoms or particles and their interactions with one another as a substance changes state. It can be very useful to have an item that demonstrates how a crystalline material forms a lattice and how its internal alignment changes as in passes from a solid into a liquid phase.</span>
Internet,air and connection
they cannot happen at the same time