Which dynasty was the first to build advanced settlements in China?

hello there the answer is a

sorry if i am wrong hope that : )

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.

c. free trade can lead to low pay for workers in poorer countries.