Explain why integration is/was necessary.

Below:

Explanation:

Integration ensures that all systems work together and in harmony to increase productivity and data consistency. In addition, it aims to resolve the complexity associated with increased communication between systems, since they provide a reduction in the impacts of changes that these systems may have.

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It's Muska...  :)

answer; /// the answer to the first question is (b) it began when people first deliberately seeds; /// and (d); // it gave people a steady food supple for the first time;