Pluto is classified as a dwarf planet.

Pluto is a dwarf planet located at the outermost part of the solar system.

He categorized the books by genre.

In this library, books are classified by genre.

We discovered a new planet.

He became the runner-up.

Jun is my best friend.

She passed the pre-2nd grade.

This library adopts its own classification method.

Taxonomy is the science of finding, understanding, and naming species of organisms.