bryophytes >advanced than green algae; >primitive than ferns

[alezcool93]

why are bryophytes more advanced than green algae but more primitive than ferns?

it's my tutorial essay question which complies 10 marks.
i only have the points on:
a) bryophytes are multicellular and green algae are unicellular
b) bryophytes don't have vascular system but ferns have vascular system

somebody please help me find more points, ASAP!
thank you!

[biolovers]

bryophyte has thallus but fern has true root,leaves and stem.

[biolovers]

i need one more point...please!