Give an Example or Else Prove That There Are None

question 24

Short Answer

give an example or else prove that there are none.
-A relation on {1, 2, 3} that is reflexive and transitive, but not symmetric.

---

Definitions:

Immunity

The ability of an organism to resist harmful microorganisms from entering it, either through innate or adaptive mechanisms.

Vaccine

A biological preparation that provides active acquired immunity to a particular infectious disease, often containing agents resembling a disease-causing microorganism.

Artificially Acquired Active

Refers to immunity obtained through vaccination, where exposure to a weakened or dead pathogen stimulates the body's immune response.

Staging

The process of classifying the extent and spread of diseases like cancer within the body, often determining the choice of therapies and the prognosis.