Submerged plants are aquatic plants that grow entirely underwater. They play a crucial role in aquatic ecosystems by providing oxygen, improving water quality, and serving as habitat for various aquatic organisms. Common examples of submerged plants include eelgrass and hornwort. These plants are adapted to live in water, with features like flexible stems and finely divided leaves that help them absorb sunlight and nutrients. Submerged plants also help stabilize sediments, reducing erosion and promoting a healthy environment for fish and other wildlife.