Topes:
- atoms of the same element that have different
numbers of neutrons, which affects the stability of the nucleus. carbon 14
is a radioactive isotope found in all living things which scientists
calculate the age of a specimen. radioactive isotopes doctors diagnose
disease, and locate and treat certain types of cancer.

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

Particle exchange energy though elastic collision , hope this .

Sorry i dont understand the question can you rephase it?

Ithink the answer is b.