What is the best way to describe a gregorian chant

What event caused south carolina to secede from union in 1860

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

Which situation would be considered an example of the freedom of association? a. three students write a letter to a local newspaper demanding that a teacher be fired. b. a group forms on a college campus to support a particular political candidate. c. an individual purchases a membership to a local gym. d. a religious organization buys several local lots in order to construct a new church building.