Answer:
I run through hills. I veer around mountains. I leap over rivers and crawl through the forests. Step out your door to find me. What am I?
I'm orange when long I'm white when short. What am I?
I have two body parts but am used to measure length. What am I?
What is black when you buy it red when you use it and gray when you throw it away?
I have a head and a tail but my eyes can never see my tail.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.