Answer:
I am essential to life on earth! I am split into thirds. Two thirds are the same. One of the thirds is 8. The other two are 1 each.
I direct you from outer space.
What do you get when you cross a snowman with a vampire?
I am expelled from you orally with a sound
Man walks over, man walks under, in times of war he burns asunder. What is it?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.