Which action occurs during a nuclear change? a. no energy is involved in the reaction. b. the nucleus disappears. c. matter changes from one state to another. d. elements are created that differ from the reactants.

Nuclear reactions involves a change in the nucleus of the atom meaning that an element can entirely be converted into another element where the atom change in atomic number, mass and type.

Based on this, the correct answer is:
D. Elements are created that differ from the reactants.

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