Ecology is the study of ecosystems. The root of the word ecosystem is derived from the Greek word 'oikos', meaning "home," and systema, or "system." It is the study of interactions among living organisms and between living organisms and their 'home' environment. Ecology is an important course enabling the learner to appreciate the role of other organisms in an ecosystem and the need for conservation of the environment. This course has both theory and practical elements of study.