images A grazer chain is a food chain a food chain.hemanth2206-20 04:43 PMGurus Please advice on the usage of A number I came here as student and OPT before, the OPT had a A number In my approved I-140 i had a A number, both the numbers are different While filing the forms for 485/EAD/AP and I-693 ( medical report ) i saw a field for A number Which number must i put in the field Regards