Here's why:

* Sperm require water for fertilization: Bryophytes, like mosses, liverworts, and hornworts, reproduce through the union of sperm and egg. However, their sperm lack flagella and cannot move independently. They rely on water droplets to reach the egg, which is located within the archegonium.

* Water is essential for spore dispersal: Bryophytes produce spores for reproduction. These spores need water to germinate and grow into new plants.

* Bryophytes lack a vascular system: They lack the specialized tissues that transport water and nutrients throughout the plant. Therefore, they are highly dependent on external sources of water, particularly for absorption and transport.

These limitations are why bryophytes are typically found in damp, humid environments. They thrive in locations with high humidity, such as forests, swamps, and along stream banks.