Answer: barter
Explanation:
In trade, barter (derived from baretor) is a system of exchange where participants in a transaction directly exchange goods or services for other goods or services without using a medium of exchange, such as money.
the two factors are inertia and gravity
It's still the liberty head nickel
The last choice “were formed by outside conquerors who unified the regions they conquered through their use of military technology”
Answer:
The answer is Dunkirk.
Explanation:
British troops were right near the Belgium-France border where the Germans encircled them through the Ardennes Forest.