Which is a characteristic of atoms?

a)they come in ten major types
b)they are the smallest units of matter
c)they can be divided
d)they cannot combine together

They are the smallest units of matter.

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

Copper, silver, aluminum, cobalt, chromium, mercury