Answer:
I am an animal and a hair product
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.
If you have me you want to share me. If you share me you don't have me. What am I?
I am a busy worker who is a water mammal.
I am a king who's good at measuring stuff. What am I?
What age most travelers have?