THE HUMAN IMMUNE SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a watercolor drawing for the current stadiums
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models of the bridges and highways crossing the river
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a piece of concrete from when one building was demolished
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photographs of buildings no longer standing
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Detailed explanation-1: -During the late 18th century, the Ohio River served as the southern border of what would later be known as the Northwest Territory. It also was generally the dividing line between British settlements in Kentucky and Native communities in the Ohio Country.
Detailed explanation-2: -The natural depth of the river varied from about 3 to 20 feet (1 to 6 m). The dams raise the water level and have turned the river largely into a series of reservoirs, eliminating shallow stretches and allowing for commercial navigation. From its origin to Cincinnati, the average depth is approximately 15 feet (5 m).
Detailed explanation-3: -Velocities on the Ohio River can range from 0.1 mph under low flow to 5 mph at flood stage. Flow-How much water is moving .