Because dinosaurs have been extinct long before humans have had the chance to analyze them‚ scientists have only been able to propose theories and make assumptions debating whether dinosaurs were warm-blooded or cold-blooded. It was believed that dinosaurs were cold-blooded because dinosaurs were related to reptiles‚ which are cold-blooded. Now many scientists have proposed many reasons why dinosaurs were warm-blooded and not cold-blooded like reptiles. One reason why scientists believe dinosaurs were
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The children’s book “How do Dinosaurs say Goodnight?”‚ by Jane Yolen conveys a tale that addresses the questions of how dinosaurs prepare to go to bed. Each page is filled with a giant dinosaur with some human characteristics and his human parents. On the first page we see a big Tyrannosaurus Rex sitting on a bed with a toy train in his hand. We see a human dad standing in the doorway staring at his watch signaling that it was time for bed. “How does a dinosaur say good night‚ when Papa comes in
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There are many theories on how dinosaurs became extinct but scientists have not yet found a proven reason why. About sixty-five million years ago Dinosauriformes‚ or as we call them Dinosaurs‚ walked and roamed planet Earth. These massive carnivores‚ herbivores‚ and omnivores lived many years on earth before humans appeared. There were several variations of dinosaurs such as land‚ sea‚ and air dinosaurs. For a millions of years the dinosaurs thrived in their environment. They had an abundant food
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you read‚ decide which of three explanations for the extinction of the dinosaurs you like best. Write an explanation of why you like it. Sex: Testes function only in a narrow range of temperature. (Those of mammals hang externally in a scrotal sac because internal body temperatures are too high for their proper function.) A worldwide rise in temperature at the close of the Cretaceous period caused the testes of dinosaurs to stop functioning and led to their extinction by sterilization of males
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Dinosaurs can be classified in the groups known as ornithischians that are bird-hipped dinosaurs. The saurischian‚ were reptile-hipped dinosaurs. Even though birds are avian their common ancestor are non-avian saurischians. “Birds have many ancestors such as the Dilophosaurus‚ Allosaurus‚ Tyrannosaurus‚ Velociraptor‚ and lastly leading to the Archaeopteryx. The closest ancestor of dinosaurs to birds are the Archaeopteryx. From each lineage or generation dinosaurs inherited certain features that make
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The Cause of the Mass Extinction in the Late Cretaceous Period Dinosaurs first appeared around 245 million years ago‚ and they lived for 180 million years. Then suddenly‚ 65 million years ago they went extinct. Not only did all the dinosaurs die out‚ but also up "to 75% of all marine genera were lost" ("mass extinction"). This leaves scientists wondering about what could have led to this mass extinction in the Cretaceous Period. They have collected evidence from fossils and earth’s geography‚ to
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Cold Blooded Nature of Dinosaurs The debate of whether dinosaurs were cold blooded or warm blooded has been ongoing since the beginning of the century. At the turn of the century scientists believed that dinosaurs had long limbs and were fairly slim‚ supporting the idea of a cold blooded reptile. Recently‚ however‚ the bone structure‚ number or predators to prey‚ and limb position have suggested a warm blooded species. In addition‚ the recent discovery of a fossilized dinosaur heart has supported
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Paleological evidence for homoeothermic tendencies in theropod dinosaurs in the Cretaceous Period Abstract Dinosaurs were considered to be cold blooded reptiles until several shocking discoveries and studies have changed the way that the general public has viewed them. Theropod dinosaurs have been selected to be analyzed because they have the strongest evidence pointing to warm blooded tendencies across the class. Carbon and oxygen isotopes in teeth enamel and physical fossilized data can be used
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Topic: Why Did Dinosaurs Go Extinct? A Gradual and Sudden End to Their Reign Introduction: About 65 mya almost three quarters of the animal and plant species on earth went extinct. This mass extinction is known as the Cretaceous-Paleogene (K-Pg) extinction event. The Cretaceous was the last period of the Mesozoic Era which is when dinosaurs lived from about 250 to 65 mya and the Paleogene is the first period of the Cenozoic Era that started about 65 mya which is the Era that we are currently living
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Were dinosaurs warm or cold blooded has been a long time debated issue. Scientist believe dinosaurs were much like modern day reptiles‚ cold blooded‚ and others believe dinosaurs were much like mammals and others birds‚ warm blooded. Dinosaurs are creatures that lived on Earth around 251 million years ago. Dinosaurs lived in the Mesozoic Era. This era contained three separate subsections: the Triassic Era‚ the Jurassic Era‚ and the Cretaceous. When the Mesozoic Era ended‚ most or a majority of the
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