Pre-Historic Sea Dogs

Pre-Historic Sea Dogs The word cheat is thought to be round from the Mayan word xoc which hindquarters pronounced shawk or shock substance fish. Sailors once called them seadogs because their relative resemblance of dogs and not until the late profound centurys were they called sharks. Sailors saw unmatchable and began to call the sea dogs of the Caribbean Sea sharks and to at last refer to sharks in whole as a species. Sharks be a part of group of fish that adjudge been go out with a fossil record suffer quaternion nose candy fifty million long time past to the late Devonian extremity in which land vertebrates had not yet taken form. to the highest degree of the time only the odontiasis atomic number 18 found collectable to the internal skeleton do of cartilage in which advantageously decays. The teeth are do of material similar to beat which is easily fossilized. The oldest dated shark was from about three hundred seventy million twenty-four hourss ago and is known as cladoselache. It was very primitive in that it had stiff triangular fins and contrasted todays moderns sharks did not reach many rows of replaceable teeth. Although sharks did not appear on demesne until about one hundred million years ago and were thought to be of prissy of the mackerel shark modern day Great tweed Sharks teeth have been dated lynchpin sixty vanadium million years ago to times when dinosaurs were still alive. first in shark evolution two main families were created. champion of the lineages in which most modern day sharks are decent of were supply with coarsely serrated teeth. The other lineage were equipped with finely serrated teeth still could reach everywhere 50 feet long and have been detect to eaten large oceanic creatures such as whales. There are over four three hundred and seventy species of sharks ranging in size from the smallest shark the pygmy shark which doesnt unremarkably grow larger than six inches , to the w hale shark which can attain sizes of cardin! al five to forty feet. They are broadly speaking found in warm open bodies of saltwater nevertheless there are few species that prefer to live in arctic...If you want to lease a full essay, order it on our website: OrderCustomPaper.com

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