Leaders are elected in a republic. Monarchies are when the king/queen rules, the title is usually hereditary and not elected. A dictatorship is kind of the exact opposite of a republic (and they usually force themselves to power militarily). Parliament basically is a system set in place to watch the government and make sure they're not doing anything bad (at least that's what I learn from Google).
C. The CFA countries use a common currency that promotes trade.
Camano Island migration affected Eurasia by ruining some of the land and making more like and making the Ocean bigger