Question

select the appositive or appositive phrase. discovered in 1930, pluto was once considered a planet, but in 2006, it was reclassified as a dwarf planet. its largest moon, charon, is nearly the same size as pluto itself.

Explanation:

An appositive is a noun or noun - phrase that renames another noun right beside it. In the sentence "Its largest moon, Charon, is nearly the same size as Pluto itself", "Charon" renames "Its largest moon".

Answer:

Charon