The basic chemical structures of living things relate a great deal to their physical structure. Various cell processes come to play also to give the human being its structure and function as seen on the exterior. Cellular organizations are equally essential, ensuring one cell functions in its place without unwanted interference with another cell and its function. Living processes depend heavily on various metabolic processes, and these processes occur in animals and plants. Humans, being the chief among higher animals, remain the main focus and end point of all biological studies.