Answer:
You do not want me when you donβt have me, but when you have me you donβt want to lose me. What am I?
What is at the end of a rainbow?
I lose my head in the morning and regain it back at night. What am I?
You use a knife to slice my head and weep beside me when I am dead.
I have a straight back and sharp teeth to cut objects.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.