Answer:
I am an animal and a hair product
I am a protector. I sit on a bridge. One person can see right through me, while others wonder what I hide. What am I?
I am round as an apple, deep as a cup. All the King's horses can't pull me up. What am I?
Tool of thief, toy of queen. Always used to be unseen. Sign of joy, sign of sorrow. Giving all likeness borrowed.
I run smoother than any rhyme, I love to fall but cannot climb. What am I?
What is always coming but never arrives?