Good Riddles

Question: There are two sisters: one gives birth to the other and she, in turn, gives birth to the first. Who are the two sisters?

Question: With pointed fangs I sit and wait, with piercing force I serve out fate. Grabbing bloodless victims, proclaiming my might; physically joining with a single bite.What am I?

Question: I am greater than God, more evil than the devil, the poor have me, the rich don't, and if you eat me, you'll die.What am I?

Question: Alone I am 24th, with a friend I am 20. Another friend and I am unclean.What am I?

Question: You use a knife to slice my head and weep beside me when I am dead.

What am I?