SKELETON: A shark's internal skeleton is made up of cartitage and connective tissue making the shark very flexible and light. Sharks have no rib cage , so when it is on land its own weight can literally crush its own body. The shortfin mako shark is one of the the fastest fish in the world along with the tuna, and the sailfish. Because of the sharks fins it cannot swim backwards and it has to fall away from objects. The only things that fossilize on a shark are teeth, vertibrate, demal denticles, and sometimes cartilidge and even soft tissue such as muscle blocks and kidney tubes. You can tell alot about a shark from its teeth. Shark teeth vary widely according to a shark's diet. Tiger sharks teeth are used for sheering, and tearing, the Port Jackson shark has teeth used to crush shell fish, the wobbegong shark has teeth used to grasp prey, and the Greenland shark has teeth so sharp that they were once used to cut hair by Eskimos. Sharks have a bite strength of 25,000 pounds per square inch, not that much different than a humans.
Organs: A shark's liver is the largest organ in the body. Shark's lack flotation bladders and that is why most will sink if they stop moving. Squaleen is an oil produced by the liver that helps sharks float. When sharks swallow something they cannot digest their stomach can be turned inside out.
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