Arrange the correct sequence of Alteration of Generation in common fern plants by numbering the stages from 1 to 6.
__ 1. Young sporophyte forms __ 2. Young gametophyte forms __ 3. Adult sporophyte with sporangium underneath the leaves __ 4. Zygote forms __ 5. Adult gametophyte having both male and female gametes __ 6. Sporangium releases spores