Aquatic organisms are living things that live in water, such as ALGAE and ALGAE. ALGAE is a type of plant-like organism that can range from single-celled to multi-celled organisms. ALGAE are found in both freshwater and saltwater environments and can be used for food, fuel, and other products. ALGAE are also important for providing oxygen to aquatic ecosystems. ALGAE can be found in a variety of shapes and sizes, from microscopic to large seaweeds. ALGAE are an important part of the food chain, providing food for many aquatic animals. ALGAE can also help to filter pollutants from the water, making it safer for other organisms.