Answer:
My teeth help me suck.
As I went over London Bridge I met my sister Jenny; I broke her neck and drank her blood and left her standing empty.
Tear me off and scratch my head, what once was red is black instead. What am I?
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?
You will always find me in the past. I can be created in the present, but the future can never taint me. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.