Which metal element could we add to an aqueous solution of MgCl2 to replace the magnesium (Mg) in a single replacement reaction?
A: (AI)

B: (CA)

C: (Cu)

D: All of these metals will replace Mg

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