The female gametophyte structure that produces eggs in nonvascular plants are called archegonia. The male structure that produces sperm are called antheridia. A gametophyt â¦ e is the part of the plant that is responsible for creating gametes AKA sexual reproductive cell (sperm or egg).
All American Express cards begin with '37,' followed by currency indicator (digits 3, 4), account number (digits 5-11), card number within account (digits 12-14), and check digit (digit 15).
On Visa, MasterCard, and Discover cards, the code is a three-digit code on the back of your card. The preceding four digits (â3456â in the image above) are the last four digits of your card number. On American Express cards, the security code is a four-digit code on the front of the card. Look above your card number on the right side of the card. Your security code, like all the other numbers on your card, is a critical piece of information.