Aquatic environments are areas where water is the primary medium for life. These environments can be found in oceans, rivers, lakes, and wetlands. They support a wide variety of organisms, including fish, plants, and microorganisms. The unique conditions in these habitats, such as salinity and temperature, influence the types of species that can thrive there. In aquatic environments, ecosystems are often divided into two main categories: freshwater and marine. Freshwater ecosystems, like lakes and rivers, contain low salt concentrations, while marine ecosystems, such as oceans and coral reefs, have higher salt levels. Each type of environment plays a crucial role in maintaining biodiversity and supporting life on Earth.