If the title is "After Hours in Kindergarten" then the theme is about what goes on in a kindergarten's experience while in school. It provides the theme and tells you what you’ll be reading about.
Answer:
1)There are several steps that someone must take to become a doctor
2)First you must earn a bachelors degree
3)Then, you must get admitted into to medical school and earn a medical degree.
4)Next, you will need to complete a residency.
5) Finally, you will need to get a medical license, and become board certified in your specialty area.
An appositive phrase modifies the subject of a sentence and is usually separated from the rest of the sentence using commas.
In this sentence, the appositive is one of Jupiter's moons.