Why does each record need a unique id number?

A unique ID number is essential if you want to build to proper relationships between tables.

Explanation:

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answer; work samples;

answer; /// multipotentialite means a person who have many different interests and creative pursuits in life; (one true calling);

polymath; means a person   of wide-ranging knowledge or learning;

scanner; means; a device that captures images from photographic prints,posters,magazine pages.ect;