What Am I Riddles

Question: When warm my house expands and when cold it contracts,
I am vital to a certain type of pact.

What am I?

Question: It's hard to give up.Remove part of it and you still have a bit.Remove another part, but bit is still there.Remove another and it remains.What is it?

Question: What goes in the water black and comes out red?

Question: Voiceless it cries,
Wingless flutters,
Toothless bites,
Mouthless mutters.

What is it?

Question: Everyone has me but nobody can lose me.What am I?