Title: Microorganisms
Description: "Microorganisms may live at the root of the evolutionary tree, but they've been around for billions of years, are found everywhere in nature, and are crucial in helping maintain the atmosphere, assisting in digestion and decomposition, and more.  Presents each general type of microorganism by its characteristics and functions, and describes the hazards and benefits of microbes."--Container..
Subjects: Microorganisms, Study and teaching, Audio-visual aids, Microbiology