Which two statements are true for both compounds and mixtures? A. They are made up of more than one type of atom. B. Their particles all have the same chemical formula. I C. Their particles are held together by chemical bonds. D. They can be separated into two or more elements.

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