Accounting for almost 60% of american exports by the beginning of the civil war, which statement regarding the impact of cotton is true?
a) the northern states provided the labor for the cotton plantations.
b) the southern states developed the plantation system and rigid social classes.
c) the invention of the cotton gin reduced the south's dependency on cotton farming.
d) the cotton production fueled the rise of manufacturing centers in the southern states.

An economic system where all or most businesses are owned by government

Afull irb committee meeting is convened and one agenda item is a new research proposal to evaluate how mothers interact with their learning-disabled child. the inclusion criteria require the children to be a minimum of five years of age. the protocol requires the mother of the child to look at the child without any expression and not to talk to the child for three minutes. the committee determined that the mother's required task may upset the child. the irb approved the study with appropriate language in the parental permission form regarding the possibility that children might become upset. after the start of the study, the principal investigator reports to the irb that, as expected, one of the children became upset. the incident was handled according to the protocol and the child is fine. what should the irb do with regard to this report?

What were some benefits of the lewis and clark expedition?