How do the functions of individual cells compare with those of organisms

The functions of the individual indepedent cells happen to different according to their morphology and anatomy. These variety in structure makes these independent individual cell function is a more simpler way than interdependent cells like of organisms. However, these interdependent cells doesn't mean they rely on process of other cells but instead they work together which readily forms the hierachy to tissues. etc and etc.

The structures of the body or the set organ relates to its function by the cell that form the organ. In a cellular level, cells makes up the tissues which make up the organ then the organ system. Focusing in organs, these organs functions accordingly as what they're supposed to do and was formed to such degree to ensure its optimum performance for example, the skin is made up of epithelial tissues which has seven layers which serves as a protective layer of the body. Another is the brain, the brain is made up of many nerve tissues and cells that allows it to do its responsibility or acted function, since nerve cells are the cells responsible for functions like sensitivity, reaction, emotion, memory, sensation & perception and etc the brain is made from brain cells, itself.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.