Is a crumbled piece of paper weight, mass, density or appearance changed? i think density.

The appearance changes because it looks different when it's crumpled and when it's flat and uncrumpled

The answer is appearance. the paper before it is crumbled is flat and smooth. once you crumble the paper, its a rough and edgy ball.

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