Final answer:
During the 18th century, the main valuable products that humans were traded for were sugar and tobacco.
Step-by-step explanation:
The main two valuable products that humans were traded for during the 18th century were sugar and tobacco.
These two products played a significant role in the economy and trade of various regions.
Sugar was produced on plantations, particularly in the Caribbean islands, while tobacco was grown in the American colonies and other parts of the world.