Because the unilateral system is easier to get as close to the dimension the engineer specified.
Bilateral tolerancing (also known as symmetric tolerancing) is a method of tolerancing a dimension using equal plus and minus deviations from the nominal dimension.
Unilateral tolerances (also known as asymmetric tolerances) on the other hand specify a deviation in only one direction, either plus or minus, from the specified nominal dimension. Unilateral tolerances may also take the form of plus and plus-plus, minus and minus-minus, or plus or minus some amount and plus or minus a lesser amount.
Answer:
Tigris and Euphrates
Explanation:
While Mesopotamia's soil was fertile, the region's semiarid climate didn't have much rainfall, with less than ten inches annually. This initially made farming difficult. Two major rivers in the region -- the Tigris and Euphrates -- provided a source of water that enabled wide-scale farming.
Religion was central to Mesopotamians as they believed the divine affected every aspect of human life. Mesopotamians were polytheistic; they worshipped several major gods and thousands of minor gods. Each Mesopotamian city, whether Sumerian, Akkadian, Babylonian or Assyrian, had its own patron god or goddess.
I think number 8 is B hope this helps!!:)
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