The Proclamation of 1763 limited the colonies from expanding west of the Appalachian Mountains. King George III of Britain proclaimed that all lands west of the Appalachian Mountain Region were uninhabitable for colonial settlers and reserved for Indigenous Americans.
Most probably because e. coli is the most harmful pathogen and appears most often in water. These contaminated water mostly compose of the bacteria which can lead to bad health.
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The Fertile Crescent was ruled by the Chaldeans from 606 - 538 B.C. and the new empire consisted of Persia, Anatolia, Babylon, Syria, Palestine, and Egypt. Glad I could help!