Liverworts, hornworts, and mosses are grouped together as the bryophytes. besides not having vascular tissue, what do they all have in common?

The choices can be found elsewhere and are as follows:

A) They are all wind pollinated.

B) They are heterosporous.

C) They can reproduce asexually by producing gemmae.

D) They require water for reproduction.

The correct answer would be option D. Besides not having vascular tissue, they require water for reproduction. Their flagellated sperm must swim through water to reach the egg. Hope this answers the question.