Heterosporous pteridophytes show certain characteristics, which are precursors to the 'seed habit' in gymnosperms. One such characteristics is
presence of vascular tissues
external water required for fertilisation
presence of embryo stage
development of embryo inside the female gametophyte
A
development of embryo inside the female gametophyte
B
presence of vascular tissues
C
external water required for fertilisation
D
presence of embryo stage
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