Found at the back of a book or in an abdomen. What am I?

Answer: appendix

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Found at the back of the book. What am I?
Found in pizza but also the sky. You'll know I'm around when I'm close by. What am I?
Four leaves I have. What am I?
From house to house I go, sometimes narrow, sometimes wide. And whether there’s rain or snow I always stay outside. What am I?
Full of dark, filled with everything Both on my skin they color With my pack, I am always Afraid of the cat. What am I?
Go slow, I'm normal. Go fast, I disappear. With only a trail to prove I was even here. I have a pair of wings. But I don't need them to fly. For that I have my "feet". What am I?
Guided, I am scraping along, leaving behind my snowwhite dust against that which I am scraping, for when I am scraping, I must. What am i?
Half of the population uses me, and you lose me all the time. I'm small and yellow, black, brown or silver. You use me to hold things up. What am I?
He has one and a person has two, a citizen has three and a human being has four, a personality has five and an inhabitant of earth has six. What am I?
Hide me from your parents if you have done bad academically this year. What am I?
I always have one eye open. What am I?
I always have to work with something in my eye. What am I?