Why must be bryophytes live in places where there is standing water for at least part of the year?

Bryophytes, which include mosses, liverworts, and hornworts, require standing water for reproduction because their sperm must swim through water to reach the eggs for fertilization. Additionally, their tissues lack true vascular systems, making them dependent on moisture in their environment for hydration and nutrient uptake. Living in areas with standing water ensures that they remain hydrated and can successfully complete their life cycle.