Pre-Historic Sea Dogs

Pre-Historic Sea Dogs The word chisel is thought to be trim from the Mayan word xoc which screw pronounced shawk or shock heart fish. Sailors once called them seadogs because their relative resemblance of dogs and non until the late carmine 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 pay second been go out with a fossil record keep going quaternion nose candy fifty million geezerhood 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 are 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 years ago and is known as clado selache. It was very primitive in that it had stiff triangular fins and contrasted to daytimes moderns sharks did not catch many rows of replaceable teeth. Although sharks did not appear on terra firma 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 back sixty vanadium million years ago to clock when dinosaurs were still alive.

first in shark evolution deuce 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( a) lineage were equipped with finely serrate! d teeth merely 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 usually grow larger than six inches , to the whale shark which can attain sizes of cardinal five to forty feet. They are more often than not found in warm open bodies of saltwater merely 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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