What is the role of Sumer, including the products and resources that were part of the trade ?

Not sure how you wanted this answered but I tried my best!

Explanation:

It was a ancient civilization known for their governance, changes in language, and their architecture. They were also well-traveled trade merchants and since their home land lacked goods such as stone, minerals, and timber they were forced to create one of History's earliest trade networks over land and sea.

answer; motor learning;

answer; self-serving bias;