Primitive aquatic organisms are a broad category of organisms that live in water and have existed since ancient times. ALGAE is one type of primitive aquatic organism, which is a group of simple, plant-like organisms that can range from single-celled to multi-celled organisms. ALGAE are found in both freshwater and saltwater environments and are an important part of the food chain. They are also used in many industries, such as food production, pharmaceuticals, and cosmetics.