Rootless aquatic plants, also known as ALGAE, are a type of plant that live in water and do not have any roots. They are typically found in both freshwater and saltwater environments and can range from single-celled organisms to complex multicellular forms. ALGAE are an important part of the aquatic food chain, providing food for many species of fish and other aquatic animals. They also play an important role in the global carbon cycle, helping to regulate the amount of carbon dioxide in the atmosphere.