True or false science and theories had to be changed many times in light of new observations and findings.

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.

What was the relationship between japan and the united states in the early 1900s?

During world war ii, the battle of guadalcanal was significant because it