Sun Cell Queries

Hi Everyone.. This is my first post since joining this cell. Attached below are the questions pondered during cell last Sun on John 1: 19 to 34

Verse 19 - 28
1. Who are the Levites?
2. What's Prophet? What's Elijah? What's prophet?
3. Who's Isaiah?
4. Why quote from the prophet?
5. Why only the 3 people stated can baptise?

Verse 29 - 34
1. How does John's water baptism reveal Jesus to Israel?
2. How does Jesus baptise with the Holy Spirit?

:)