The Ender Dragon

The Ender Dragon trivia questions

1. What dimension does the Ender Dragon live in?
2. What item must you activate to reach the Ender Dragon's dimension?
3. What color are the Ender Dragon's eyes?
4. What blocks make up the pillars the Ender Dragon heals from?
5. How many End Crystals sit atop the obsidian pillars at the start?
6. What is the Ender Dragon's total health in half-hearts?
7. What happens if you re-enter the End portal after the dragon is defeated?
8. How many End Crystals are needed to respawn the Ender Dragon?