Which best describes the process of smelting? A. It removes ore from the ground and has minimal impact on the environment.
B. It extracts metal from ore and it is very harmful to the environment.
C. It removes particles from a water source and has minimal impact on the environment.
D. It produces steam that generates electrical power and it is very harmful to the environment.

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

A.(nh4)(2co3)is the correct answer