Answer:
Face with a tree skin like the sea. A great beast I am. Yet vermin frightens me.
What has many keys but can't open a single lock?
I am a word of letters three. Add two and fewer there will be. What word am I?
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 have a neck and no head two arms but no hands. I go with you to school I go with you to work.
What age most travelers have?