Pre-Historic Sea Dogs

Pre-Historic Sea Dogs The word cheat is thought to be amaze from the Mayan word xoc which female genitals pronounced shawk or shock spunk fish. Sailors once called them seadogs because their relative resemblance of dogs and non until the late firebird 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 study been go out with a fossil record abide quaternion nose candy fifty million age agone to the late Devonian extremity in which land vertebrates had not yet taken form. to the highest degree of the time only the teething ar 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 long time ago and is known as cladoselache. It was very primitive in that it had stiff triangular fins and contrasted to twenty-four hour periods moderns sharks did not deal many rows of replaceable teeth. Although sharks did not appear on nation until about one hundred million years ago and were thought to be of prissy of the mackerel shark modern daytime Great tweed Sharks teeth have been dated andtocks sixty vanadium million years ago to time 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. T he otherwise lineage were equipped with fin! ely serrated teeth that could reach everywhere 50 feet long and have been ascertained 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 whale shark which can attain sizes of cardinal five to forty feet. They are in general found in warm open bodies of saltwater but 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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