Micro-organisms: Microbes are tiny living organisms—too tiny to see without a microscope, yet they are abundant on Earth. They live everywhere—in air, soil, rock, and water at any extreme environmental condition. There are many varieties of microbes elsewhere on this planet like, protozoa, bacteria, fungi, plant virus, viroids and prions. Like, bacteriophase virus, tobacco mosaic virus and many others. The most diverse variety is of microbes.