Which was part of sumerian farming and trading

Explanation:

This method was also used in Egypt Empire. When floods seasons was comming, they built levees to prevent a disaster, but their crops were full of water, so during this period, The Pharaoh made them work in construction of the big buildings as other workers.

while it was true that the cotton gin reduced the labor of removing seeds, it did not reduce the need for slaves to grow and pick the cotton.

explanation:

before eli whitney's invention of the cotton gin, picking and cleaning cotton was a slow, labor-intensive job. workers, usually slaves, had to pick the seeds from the cotton fibers by hand. this invention made it possible to grow large amounts of cotton on big farms and make money.