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).
With Visa, MasterCard, and Discover, the credit card numbers are 16 digits long, and the 7th digit to the 15th digit is the account number. This leaves nine digits for your account number â providing billions of possible combinations. With American Express, there are only 15 digits to the account number.