In this article we will discuss about Non-Pathogenic Microorganisms:- 1. Groups of Non-Pathogenic Microorganisms 2. Activities of Non-Pathogenic Microorganisms. Groups of Non-Pathogenic Microorganisms: Microorganisms may be divided into two groups — according to their activities: (a) The useful, and (b) The harmful. The first group the harmless, non-pathogenic microorganisms to man live mostly in the […]