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They are characterized by having a two-part hinged shell that is joined by a ligament and muscles. Bivalves are found in marine, freshwater, and even terrestrial habitats worldwide. The Wikipedia page on Bivalvia provides detailed information on the classification, anatomy, and physiology of bivalves. It covers their evolutionary history, including fossil records dating back to the Cambrian period. The page also describes the diverse feeding habits and reproductive processes of bivalves, including filter-feeding and broadcast spawning. Additionally, the page highlights the ecological significance of bivalves, as they are important components of aquatic ecosystems. Their filter-feeding behavior contributes to water filtration and nutrient cycling, while their shells provide shelter for other organisms. Bivalves also have economic importance as a food source and in the pearl industry. The Wikipedia page on Bivalvia also explores the various interactions bivalves have with humans and other organisms. It discusses the ecological threats faced by bivalves due to habitat loss, pollution, and overharvesting. Furthermore, the page features information on the cultural significance of bivalves in different societies and their role in scientific research. Overall, the Bivalvia Wikipedia page offers a comprehensive overview of these diverse and fascinating mollusks, covering their biology, ecology, and cultural importance. It serves as an authoritative resource for anyone seeking information about bivalves and their significance in the natural world.