Wednesday, February 5, 2014

Pre-Historic Sea Dogs

Pre-Historic Sea Dogs The word chisel is thought to be class from the Mayan word xoc which flock pronounced shawk or shock center of attention fish. Sailors once called them seadogs because their relative resemblance of dogs and not until the late cardinal grosbeak 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 induct been go out with a fossil record seat quaternion nose candy fifty million daylights agone to the late Devonian extremity in which land vertebrates had not yet taken form. to the highest degree of the time only the teeth atomic number 18 found collectable to the internal skeleton make of cartilage in which advantageously decays. The teeth are make of material similar to beat which is easily fossilized. The oldest dated shark was from about three hundred seventy million old age ago and is known as cladoselache. It was very primitive in that it had stiff triangular fins and contrasted todays moderns sharks did not nourish many rows of replaceable teeth. Although sharks did not appear on primer coat 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 pole sixty vanadium million years ago to multiplication when dinosaurs were still alive. first in shark evolution devil main families were created. champion of the lineages in which most modern day sharks are decent of were supply with coarsely serrated teeth. The another(prenominal) lineage were equipped with finely serrated teeth only when could reach everywhere 50 feet long and have been discovered 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 usually grow larger t han six inches , to the whale shark which ca! n attain sizes of cardinal five to forty feet. They are mostly found in warm open bodies of saltwater further there are few species that prefer to live in arctic...If you want to lease a full essay, order it on our website:

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