Answer:
Curtail me thrice I am a youth; behead me once a snake; complete I'm often used in truth when certain steps you'd take.
I keep growing and am practically indestructible. I get eaten, but always come back. I survive cold and lie everywhere. You see me everyday. What 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?
If you're looking for something sweet I know what to do. But if you don't like heat I'm not for you.
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?