Mercantilism was an economic theory used in Europe during the 16th century up until the 18th century. One of mercantilism's policies included not allowing colonies to trade with other countries except the mother country.
Answer:
<em>The greenhouse effect is a process in which the warming of earth takes place, mostly as a result of excess greenhouse gases, which enclose and trap energy that would have otherwise left earth. ... A biologically sound process, the Greenhouse was fashioned by the earth in order to maintain temperature and trap heat.</em>
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Grassroots is on opposition to the main power; it refers to the individual people, and their organisation, who are not in power positions. Often this means a local organisation, which focuses on the specific issues of the group rather than tries to participate in big-scale politics.