Answer:
I shoot but never kills
People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?
My first is in fish but no in snail. My second is in rabbit but not in tail. My third is in up but not in down. My fourth is in tiara but not in crown. My fifth is in tree you plainly see. My whole a food for you and me.
I am milky white and scares people.
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.