Biology is the science of life. It includes study and research related to evolution, development, distribution, structure, physiology, ecology, genetics, and molecular content and function of plants, animals, and microorganisms. Biological investigations emphasize the relationship of living organisms to each other and to their environment. There are many areas of specialization within the biological sciences, such as the fields of anatomy, physiology, environmental studies, botany, zoology, horticulture, genetics, and molecular biology. Divisions of applied biology include medicine, nursing, nutrition, pharmacology, and medical technology.