Use the diagram below to answer the question. If ammonite fossils are dated to be approximately 65 million years old which of the following is true according to this fossil record?
A. Rock layer C is relatively younger than 65 million years old.
B. Rock layer A is relatively younger than 65 million years old.
C. Rock layer D is relatively younger than 65 million years old.
D. Rock layer B is relatively younger than 65 million years old.

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