Question

Which of the following has a real existence?

• A. Class
• B. Phylum
• C. Genus
• D. Species

Answer 1

Answer: (D)

• Phylum, Class, and Genus are various taxonomical categories that only have a theoretical existence for the sake of convenience while species have a real existence which is defined as a group of interbreeding population.
  
• Example: Cats represent a species having real existence which belong to the genus Felis and family Felidae which do not an organism in living world.

So, the correct option is 'Species'.