Which of the following statements is true about the movement of fluid in a convection cell? A. Cool fluid rises because it is less dense B. Hot fluid rises because it is denser C. Cool fluid sinks because it is denser D. Hot fluid sinks because it is less dense

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

Outermost (valence) electrons