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How many fish species are there? What is the world's largest fish? The smallest? Which is the oldest fish, as a class? Do fish sleep? How long do fish live? Do fish chew their food? Can fish swim backwards? What is the most common fish in the sea? How do porcupine fish inflate themselves? How much electricity does an electric eel generate? What do oysters and clams eat? Clams seem to squirt water through their siphons. What purpose does the siphon serve? How big do shrimp grow?How long do they live?
