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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In the movie “The Land that Time Forgot (1975)” we noticed that‚ although some of dinosaurs portrayed had some accuracies to their characteristics‚ most had glaring flaws. The first dinosaur we addressed was the Pterodactylus. The movie accurately portrayed the Pterodactylus because it has a short tail‚ 3 claws per wing and it is only shown during the day. The inaccuracies of the movies Pterodactylus were that it was way too big (was said to have an actual wingspan of around 1 meter)‚ it did not
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Elizabeth Appel English 101-12 4th March 2013 Dinosaurs in Science It is the 21st century we are living in‚ science and technology has advanced like never before. Science is basically a way of knowing but in P.B. Medawar’s words‚ “The art of the soluble.” Science has explanations to several unusual activities throughout the world that had taken place even before mankind existed and their research still goes on. The study on the extinction of dinosaurs is a timeless study but nowadays the young
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What Did Dinosaurs Really Look Like? In a luminous top-floor workshop closed to the public at the American Museum of Natural History in New York‚ artists work with scientists to re-create scenes from lost or vanishing worlds. This is the birthing room for the museum’s elaborate dioramas‚ such as the brace of Northwest Indians who air-paddle their canoe through a fluorescent entrance hallway‚ or the 94-foot blue whale that swoops down from the duplex ceiling of the Ocean Life Hall‚ or the herd
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