Answer:
I am a protector. I sit on a bridge. One person can see right through me while others wonder what I hide.
Weight in my belly trees on my back nails in my ribs feet I do lack.
I am the word that is always spelled correctly by everyone.
It's been around for millions of years but is never more than a month old. What is it?
What goes into the water black and comes out red?
If a rooster lays an egg on the exact peak of a barn, which side does it fall?