Answer:
I am a type of weapon for SCI-FI characters
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.
I hatch without food
I am what bring things together. Without me everything you see would be a total mass or debris everywhere.
I am whole but incomplete. I have no eyes, yet I see. My largest part is one fourth of what I once was. What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.