Feudalism started about A.D 700
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Plastic pollution is now considered one of the largest environmental threats facing humans and animals. The material is made to last much longer than a human lifetime, but that also means its impact on the planet lasts a lifetime too.
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The Greek city-state was governed by an oligarchy? Oligarchy in the Greek polis. Oligarchy supposes the government of a minority, while democracy supposes the government of many people.