Answer:
What can be swallowed, but can swallow you?
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.
Pregnant every time you see her, yet she never will give birth.
You throw away the outside, eat the inside, then throw away the inside. What is it?
Until I am measured I am not known, Yet how you miss me when I have flown.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.