I believe the answer is: Division of Labor.
Division of labor is always necessary because one part of the economic operation wouldn't be able to done without the completion of other parts, no matter how small it is.
For example, a manager of a big restaurant wouldn't be able to fulfill their revenue goals if the cashiers do not keep the money properly.
Answer:
A. The Model is a different shape is your correct answer.
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I believe Ferdinand Magellan？
<span>The Plow is to the second social revolution as the steam engine was to the third social revolution.
Plow is an agricultural implement used for cutting, lifting, turning over and partly pulverizing soil. A social revolution is a fundamental change in a society. </span>Alexander Berkman says, <span>Social revolution means the
reorganization of the industrial, economic life of the country and consequently
also of the entire structure of society.</span>
