Microbiology is the study of microbes and their interactions with humans, animals, plants, and the environment. Microbes are those organisms usually too small to be seen by the naked eye, such as bacteria, viruses and archaea, and eukaryotes like yeast, protozoa and algae. Microbes influence all living things and contribute to all manner of chemical and physical processes. Because these activities are so diverse, the science of microbiology is multidisciplinary, calling on the skills and knowledge of individuals specializing in many different fields of life science, environmental science, and engineering. Microbiology arose, and continues to profit from, several previously independent scientific and medical disciplines, including bacteriology, virology, public health science, clinical microbiology, immunology, parasitology, vaccinology, and a host of other areas of inquiry. Microbiologists work in basic and applied research, clinical settings, manufacturing of food and other goods, public health, environmental protection, and other domains.