They ensure continued for production
Answer:
B
Explanation:
The printing press allowed mass production of books that spread new scientific ideas.
D the Stratosphere
hope that helps
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>
