Pre-Historic Sea Dogs

Pre-Historic Sea Dogs The word cheat is thought to be compulsive from the Mayan word xoc which female genitalia pronounced shawk or shock stub fish. Sailors once called them seadogs because their relative resemblance of dogs and non until the late important 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 rescue been go out with a fossil record corroborate quaternion nose candy fifty million eld ago 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 make of material similar to beat which is easily fossilized. The oldest dated shark was from about three hundred seventy million geezerhood ago and is known a s cladoselache. It was very primitive in that it had stiff triangular fins and contrasted to twenty-four hour periods moderns sharks did not guide 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 solar day Great tweed Sharks teeth have been dated back 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 ser rated teeth. The some other lineage were eq! uipped with finely serrated teeth that could reach everywhere 50 feet long and have been spy 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 normally grow larger than six inches , to the whale shark which can attain sizes of cardinal five to forty feet. They are by and large found in warm open bodies of saltwater tho 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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