Rewrite the paragraph making the required corrections (spelling, forms of tense, pronoun reference, subject-verb agreement, and punctuation marks.…

 Rewrite the paragraph making the required corrections (spelling, forms of tense, pronoun reference, subject-verb agreement, and punctuation marks. 

 Marketing are one of the oldest professions. Marketing emerged from the older concept of exchange. The complex marketing system of to-day has evolved through different stages of economic development. Today, marketing is a complex activity because a marketer has to coordinate and manage several things before reaching the target group. Marketing as a serious subject of study and as a major management function have been evolving in the last six decades. As a subject of study, they has borrowed concepts, theories and empirical models from other disciples, particularly from 'economics' the mother of morden marketing. However, other disciplines such as psychology, sociology, and statistics have contributed a lot to the marketing discipline.