25. A. ,
property enables a substance to combine with or change into one or more

It changes food into energy that the organism can use.

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

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess

What are the options? i can you if you give them.