No, a birth certificate is not valuable enough to be sold for money.
see link
yes
It means that you were born in a part of the United Kingdom, either England, Wales, Scotland or Northern Ireland. So the birth certificate has been issued by the United Kingdom.
You don't need a passport to fly within the continental US or your birth certificate.
If either parent was a citizen of Ireland at the time of the birth, the newborn would automatically be a citizen of Ireland as well.
Yes
Well Most likely yes it is
I think you would be able to ask my daughter Nicole that question.
The authorized birth certificate may refer to the Original birth certificate rather than the Copy of the Birth Certificate.
Why would you want to sign a birth certificate?
only if you were born in the united states with a U.S. birth certificate