Mark the statement if it correctly describes the great wall.
a.
it was built to protect qin's empire from foreign invasion.
b.
it was built along the southern border of qin's empire.
c.
the entire structure was built during the qin dynasty.
d.
it is the longest man-made structure in the world.
e.
it can be seen from the moon.
multiple answer only got c.

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How did the invention of the cotton gin affect slave labor in the united states? a. there was a forced migration of slaves from the south to the north. b. slave-owning cotton planters were gradually forced to sell their plantations. c. more slaves were purchased to work on cotton plantations in the south. d. the reduced need for labor on cotton plantations led to a decline in slavery. e. slaves were moved from cotton plantations to sugar plantations.