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).
For example, even though American Express, Diner's Club and Carte Blanche all start with the number 3, you can confirm American Express numbers if the first digit, 3, is followed by a 4 or a 7. However, if a zero, 6 or 8 follow the 3, the credit card number belongs to a Diner's Club or Carte Blanche account.or example, Visa account numbers are either 13 or 15 digits long. If you see a credit card number that starts with a 4 and contains 13 or 15 digits, you can assume it's a Visa.