Answer:
I'm blue at day and black at night. I do contain some creatures born and died. What am I?
I am an object which is used in baseball during the day I can't be seen at all
I am an odd number that become even when beheaded.
In all the world none can compare I am a tiny weaver my deadly cloth so silky and fair.
I break down buildings, I crumble mountains but you can't see me. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.