Generally, a copy of the biometrics appointment notice is sufficient, though it could depend on the circumstances.

Both of my colleagues are correct. Impossible to predict, but it will either be returned to you with the check so you can resubmit correctly, or...

Please see here for more information,...

You can find processing times at https://egov.uscis.gov/processing-times/. While I've sometimes found electronically-filed I130s to be processed...

This likely means that the consular officer cleared whatever issue was causing the refusal/administrative processing for at least some applicants.

It is theoretically possible. Whether it will work for you depends on a number of factors, including whether you will be able to remain in the U.S....

It will not affect your H-1B eligibility or your EB green card eligibility, though it could impact other immigration options not mentioned. It...

Your number does not change. You do not need a new card in this situation. Working on a c8 EAD could impact your F1 status, so discuss that with...

Not yet, so continue to monitor this.

While you meet the basic eligibility requirements for an F-2 visa, the consular officer will need to determine if you are entitled to the visa.