What Am I Riddles

Question: Crawls over pages and fells wild beasts.
Helps guide you along in your home and on streets.

What is it?

Question: I'm the part of a bird that's not in the sky,
I can swim in the ocean and remain dry?

What am I?

Question: What gets easier to pick up the larger it gets?

Question: I may be of the eye,
in order I am pie,
in my center there is a star,
I keep medics where they are.

What am I?

Question: What asks but never answers?