mcdougal littell algebra 1 book

The textbook is in excellentgbeltrao08-30 04:42 PMMy wife had her fingerprinting done about a year ago. Same happened for the medical exam. I had my I-140 approved and we're now on the I-485 stage. Yesterday my wife received a letter scheduling an appointment to do a biometric at our local uscis office... what is this biometrics about since the med exam and fingerprints are done? Would this be