If you go near them they blow up. You can kill them with a sword. They spawn only at night or in caves; Somewhere dark
No, Creepers just flee from them.
Yes, creepers were an error, they messed up a pig...
Nothing.
No, Creepers do not burn, the sun burns undead such as Zombies and Skeletons.
Creepers and Ghasts will sometimes drop it when you kill them.
There aren't "ancient creepers" in the application version of Minecraft, there are creepers.
It's called Minecraft... creepers have ALWAYS been in Minecraft.
No, Creepers just flee from them.
Yes, creepers were an error, they messed up a pig...
Yes
No hostile mobs (including creepers) are present in peaceful difficulty.
Yes
Yes, they will explode.
Nothing.
They explode once they sees you.
Kill Creepers.
Yes