Explanation:
Can't count, it's too many
The answer is D (they usually occur on the boundaries of plates.
The correct answer is letter D. an economy based on trade. The people who migrated to Melanesia developed <span>an economy based on trade. Before the time of currency was used, people back then do trading with their property they own if they want to have something. It's like the same as the barter system or the barter economy.</span>
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