Answer:
I am what brings things together. Without me everything you see would be a total mass or debris everywhere. What am I?
When you take away the whole from me there is always some left.
I open to close but I close to open. I'm surrounded by water but I'm never soaking. What am I?
I make you weak at the worst of all times. I keep you safe, I keep you fine. I make your hands sweat and your heart grow cold. I visit the weak, but seldom the bold. What am I?
In my life I must bare, my bloodline I must share. What am I?
Some try to hide some try to cheat. But time will show we always will meet. Try as you might to guess my name. I promise you'll know when you I do claim.