What purpose do colons serve in a sentence or phrase?

Match the academic requirements with the careers. technical program bachelor's degree high school diploma equal opportunity officer arrowright court reporter arrowright security officer arrowright

What is rand's reason for including the ra. pe scene?   how does the event change both roark and dominique?   discuss how current attitudes on relations between the se. xes have changed since the publication of the fountainhead.

Why is figure of speech important in reading and writing?