The answer you're looking for is D, The direct exchange of one set of goods or services for another
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The civilization of ancient Egypt was indebted to the Nile River and its dependable seasonal flooding. Their farming practices allowed them to grow staple food crops, especially grains such as wheat and barley, and industrial crops, such as flax and papyrus. ... They excelled in horticulture
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Answer: these staggering number of results of decades of changes in childbearing and mortality patterns
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