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a sharks life span is about 20-30 years.

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Baby sharks are nourished through the umbilical chord like humans

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the ampullae of Lorenzi senses water pressure, electrical fields, and salinity

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the shark has a very large and complex brain

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the liver has two lobes and contains oils and fatty acids

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water must continually flow over their gills in order for them to breath.

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the sharks heart is only two chambers. it is very small compared to the rest of their body this is why sharks have low blood pressures.

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the spiral valve is internally twisted to increase the surface area which increases nutrient absorption

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85% of a sharks weight is muscle.

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the skeleton of an elasmobranch  is made up of cartilage

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They are very big creators
Although some may think they are scary
They don't mean any harm.

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Sharks are very amazing   creators
there are many different kinds of sharks
sharks make our ocean fascinating.

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This video talks about oceanic white tip sharks. They are from Hawaii and look similar to whales.

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oceanic whitetip shark (organism classification)

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Oceanic Whitetip Sharks | JONATHAN BIRD'S BLUE WORLD

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In the warm and blue waters off Hawaii, Oceanic White Tip sharks often follow behind pods of Pilot whales. For the longest time, biologists have had no idea what is going on. Are they eating the whales? Are they stealing food from the whales?

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This video is about thresher sharks. Thresher sharks have the longest tails in the world.

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Philippines Thresher Sharks | JONATHAN BIRD'S BLUE WORLD

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The Thresher shark may very well be the strangest looking shark in the world, with a tail almost as long as its body. This shark is very rare, almost never seen by divers....until now. Using advanced diving technology, Jonathan visits a remote reef in the Philippines where Thresher sharks show up every morning to be cleaned by small fish.

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This video is about bull sharks. It gives information about bull sharks and how they survive.

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Bull Sharks | JONATHAN BIRD'S BLUE WORLD

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bull shark

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sharks need to have water go over their gills to keep breathing

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sharks do not have scales

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sharks can detect movement through their lateral line system

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sharks have rows of teeth

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sharks are cartilaginous fish