Organisms that are so small that they can only be observed through a microscope, for instance bacteria, fungi or yeasts.Microorganisms consist of a huge phase of the world’s occurring substances and act as a primary driver in preserving the earth’s ecosystem. Each microorganisms possesses a trait that falls alongside reproduction, morphology, or cellular composition. Microorganisms are highly advantageous in generating air (oxygen), and dissolving organic substances, bringing in nutrients for plant life, and improving human health.