Answer:
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
If you've got me I'm everywhere. If you share me I'm nowhere. What am I?
What goes through cities and fields but never moves?
In my life I must bare my bloodline I must share.
In all the world none can compare I am a tiny weaver my deadly cloth so silky and fair.
When is it bad luck to see a black cat?