1.2: Microbes and the World Last updated Jan 3, 2021 Save as PDF 1.1D: Koch and Pure Culture 1.2.1: 1.2A Types of Microorganisms Page ID8624 BoundlessBoundless ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy1.2.1: 1.2A Types of MicroorganismsMicroorganisms make up a large part of the planet’s living material and play a major role in maintaining the Earth’s ecosystem.1.2B: Classification of MicroorganismsMicroorganisms are classified into taxonomic categories to facilitate research and communication.1.2C: Microbes and the Origin of Life on EarthLife on Earth is thought to have originated from the oldest single-cell archaea and bacteria.1.2D: Environmental Diversity of MicrobesMicrobes are ubiquitous on Earth and their diversity and abundance are determined by the biogeographical habitat they occupy.