Which of the following statements is true? 1.the organ system is the lowest level in the hierarchy. 2.organ systems are less complex than the organs they are made from. 3.the success of a system depends on the proper function of its parts. 4.the muscular system does not need the skeletal system to move the body.

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later