* Temperature: Water snails can survive in a wide range of temperatures, from cold mountain streams to warm tropical oceans.
* pH: Water snails can tolerate a wide range of pH levels, from acidic to alkaline.
* Salinity: Water snails can live in both freshwater and saltwater environments.
* Dissolved oxygen: Water snails require dissolved oxygen to breathe. The amount of dissolved oxygen required varies depending on the species of water snail.
* Substrate: Water snails can live on a variety of substrates, including sand, mud, gravel, and rocks.
* Food: Water snails are generally omnivorous and feed on a variety of plants, algae, and animals.
Water snails play an important role in the aquatic ecosystem. They help to break down organic matter, recycle nutrients, and provide food for other animals. Water snails are also an important part of the food chain, and are prey for fish, birds, and other animals.