* Lack of vascular tissue: Mosses don't have the specialized tissues (xylem and phloem) that vascular plants use to transport water and nutrients efficiently. This means they rely on direct absorption through their leaves and stems.

* Water for reproduction: Mosses require water for their sperm to swim to the egg during fertilization. Moist environments provide the necessary moisture for this crucial step in their life cycle.

* Water for survival: Like all plants, mosses need water to perform photosynthesis, the process by which they convert sunlight into energy. Moist environments provide the water they need for this vital function.

In summary, mosses thrive in moist areas because they lack the sophisticated transport systems of vascular plants and require water for both reproduction and basic survival.