What Am I Riddles

Question: Without one or the other both would not exist. what i'm I ?

Question: I am a cold man without a soul. If there is warmth in me, it slowly will kill me. What am I?

Question: What grows when it eats, but dies when it drinks?

Question: When is... 5>0, 0>2 and 2>5? Hint: Hands

Question: It breaks away from its pack. It creates holes in its victims. It can travel for miles and then disappear. It is part of a dying breed. What is it?