The Great White Shark Essay

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Sharks don’t fossilize well because they’re from the class of chondrichthyes meaning their skeletons are made of cartilage, a flexible connective tissue. This is one of the reasons why there is a disagreement over when the first shark first existed. However, shark teeth do fossilize well and sharks produce thousands of teeth in a lifetime. The oldest shark teeth date back to the Devonian Period about 400 million years ago and were found in Europe. Shark scales also fossilize well. Paleontologists can discover many important things from fossilized shark teeth and scales even though it doesn’t seem like much. Their discoveries include information about species, size and behavior. While it is controversial, some paleontologists believe that the first scales are from the Ordovician Period 455 million years ago. Nonetheless, the scales found in Siberia and Mongolia during the SIlurian Period 420 million years ago are definitely from sharks.
More complete fossilized shark remains are
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This shark has unique blood flow that circulates in opposite direction for an efficient transfer of metabolic heat.This allows for heat to exchange efficiently around the body in the brain, swimming muscles and stomach, so the Great White can go in waters too cold for other sharks. Reproduction for the Great White is like many other sharks, it generically uses internal fertilization to develop offspring. The mother carries the yolk like shelled eggs until body development is complete, this time period of her life is called ovoviviparity. After a year or longer he pups (baby sharks) are ready to be born in to the water. Right when the pups leave their parents they are forced to fend for themselves and live on their own. It can be said that it takes up to a whole year or longer for the mother to rebuild her energy before becoming a parent

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