Answer:
I can ruin your day, or darken your life. And while I'm expected, I'm never alright. I'm bad for business, and worse for your hair. Wherever I am, there's something not there.
My first is in window but not in pane. My second's in road but not in lane. My third is in oval but not in round. My fourth is in hearing but not in sound. My whole is known as a sign of peace. And from noah's ark won quick release.
I have a neck but no head. I have a body but no arm. I have a bottom but no leg.
Long and slinky like a trout, never sings till it's guts come out.
I have split the one into five. I am the circle that few will spy. I am the path that breaks and gives. I am the bow no man may bend.
What is lighter than what it is made of?