Answer: the invention of cotton gin
Explanation:The cotton gin refers to a a machine that sets aside cotton fibers from their seeds. Therefore, the invention of the cotton gin transformed the cotton industry in the United States and demanded cheap labor force, which led to the rise of slavery in the South and to the American Civil War later.
The spiders in this family must have different proteins for silk flexibility in their cells. ... Protein molecules' structures affect their function and the way they connect to other molecules.
Legislation addressed child care need for working women
to keep enemys and predators
