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Teach your students more about sharks with these free printables. It turns out that Earth Day has been around since 1970. It is thought that most sharks live 20-30 years, though the actual lifespan depends on the breed. Sharks are carnivores (meat-eaters) that feed on fish, crustaceans, seals, and other sharks. They must swim constantly to pump water through their gills in order to survive. Some sharks, like the Great White, never sleep. We have 100 Pictures about crossword puzzles for adults best coloring pages for kids like crossword puzzles for adults best coloring pages for kids, 10 best printable crosswords for adults printableecom and also free easy printable crossword puzzles for adults. When they lose a tooth, another grows back to take its place. Instead, their skeleton is made up of a firm, flexible material called cartilage (like a person's ears or nose) which is covered by scales. They breathe through gills rather than lungs, and they don't have bones.

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The young sharks are born with a full set of teeth and are ready to be on their own soon after birth - which is good since some fall prey to their own mothers!Īlthough some sharks lay eggs, most species give birth to live pups, usually one or two at a time. Most sharks live in the ocean, but some, such as the bull shark, can survive in freshwater lakes and rivers.Ī shark's offspring is called a pup. They range in size from the tiny Dwarf Lanternshark, which is only about 8 inches long, to the huge whale shark, which can grow up to 60 feet in length. However, there are more than 450 species of sharks. When we hear the word shark, most of us think of ferocious predators like the Great White shark is portrayed in like Jaws. A person is more likely to be struck by lightning than attacked by a shark. On average, there are less than 100 fatal shark attacks worldwide each year. Sharks have a bad reputation as scary, man-eating creatures, but the reputation is undeserved for the most part.