Question

Io, one of Jupiter’s moons, is dotted with active volcanoes.

Which word or phrase is an appositive in the sentence?

Answer 1

One of Jupiter's Moons :) 

Answer 2

one of Jupiter’s moons

Step-by-step explanation:

An appositive phrase is a noun or a noun phrase that "renames", identifies or gives further information of another noun placed right beside it. When they are not essential to the meaning of the sentence, they are set off by commas just like "one of Jupiter’s moons" is. This noun phrase is appositive because it renames another noun: "Io"