complicated system
21Immune system — A scanning electron microscope image of a single neutrophil (yellow), engulfing anthrax bacteria (orange). An immune system is a system of biological structures and processes within an organism that protects against disease by identifying and… …
22Centimetre gram second system of units — The centimetre gram second system (CGS) is a system of physical units. It is always the same for mechanical units, but there are several variants of electric additions. It was replaced by the MKS, or metre kilogram second system, which in turn… …
23Ice protection system — Ice protection systems are designed to keep atmospheric ice from accumulating on aircraft flight surfaces while in flight. The effects of ice accretion on an aircraft can cause the shape of airfoils and flight control surfaces to change, which… …
24XY sex-determination system — Drosophila sex chromosomes The XY sex determination system is the sex determination system found in humans, most other mammals, some insects (Drosophila) and some plants (Ginkgo). In this system, females have two of the same kind of sex… …
25Judicial system of Finland — Under the Constitution of Finland, everyone is entitled to have their case heard by a court or an authority appropriately and without undue delay. This is achieved through the judicial system of Finland.The Finnish judicial system consists of… …
26Yoshizawa-Randlett system — The origami crane diagram, using the Yoshizawa Randlett system The Yoshizawa Randlett system is a diagramming system used to describe the folds of origami models. Many origami books begin with a description of basic origami techniques which are… …
27CDC Classification System for HIV Infection in Children — Due to the additional knowledge of the progression of HIV disease among children, a revised classification system for HIV infection in children was developed in 1994 that replaced the pediatric HIV classification system that was published in 1987 …
28WGA screenwriting credit system — In the United States, screenwriting credit for motion pictures and television programs under its jurisdiction is determined by either the Writers Guild of America, East (WGAE) or the Writers Guild of America, west (WGAw). The Guilds are the final …
29Operating system — Operating systems …
30File system — For library and office filing systems, see Library classification. Further information: Filing cabinet A file system (or filesystem) is a means to organize data expected to be retained after a program terminates by providing procedures to store,… …
