In Africa, Senegal represented the biggest trade partner of the Gambia in 2007, which is a defining contrast to previous years that had Guinea-Bissau and Ghana as equally important trade partners.
2.
Principe goes on to argue that, " [ a ] ll their chymical activities were unified by a common focus on the analysis, synthesis, transformation, and production of material substances . " Therefore, there is not a defined contrast between the two fields until the early 18th century.
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