Dinosaurs, Extinction Theories For
نویسندگان
چکیده
ammonites Shelled group of invertebrates related to octopus, squid, and nautilus. amniota Taxon of vertebrates including mammals and reptiles (including birds). archaic ungulates (or condylarths) Extinct group or grade of mammals possibly giving rise to hoofed mammals. chondrichthyeans Sharks and their relatives. ectotherm Animals that produce their heat from external sources such as the Sun. endotherm Animals that produce their heat internally through metabolic means. K/T Abbreviation for Cretaceous/Tertiary, usually in reference to the K/T boundary. nonavian dinosaurs Dinosauria excluding birds. ornithischians Bird-hipped dinosaurs such as horned and duck-billed dinosaurs. palynomorphs Pollen and spores produces by plants. saurischians Reptile-hipped dinosaurs such as theropods.
منابع مشابه
The Extinction of the Dinosaurs
Dinosaur extinction is still a major enigma of Earth history. In this review article, extinctions in the geological record will be briefly mentioned. Many of the imaginative theories for the extinction of the dinosaurs will also be presented. Within the uniformitarian paradigm, the meteorite impact theory, once considered 'outrageous', now is the dominant theory. However, the volcanic theory is...
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The extinction of the dinosaurs is an import issue that can shed light on the repeated occurrences of mass extinctions. It is very important that we don’t blindly accept theories because they are lavish and extravagant. Our aim is to show that dinosaurs didn’t die out due one catastrophic celestial event. On the contrary we intend to prove that their extinction was a much more complex process t...
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The development of concepts of individual death and species extinction were examined in two studies. Sixty-eight, 4to 9-year-old children and their parents participated in Study 1. Although preschoolers had some understanding of the concept of death, the ability to explain death and extinction improved over the school-age years. However, all age groups were reluctant to accept that extinction m...
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When we hear the word extinction, most of us immediately think of dinosaurs and woolly mammoths and cataclysmic events precipitating their extinction. Some of us are also aware of current extinction threats and recent extinctions, but few, if any, of us understand the varying and complex circumstances under which extinction actually happens. It turns out that extinction and species survival are...
متن کاملExtinction and Survival
When we hear the word extinction, most of us immediately think of dinosaurs and woolly mammoths and cataclysmic events precipitating their extinction. Some of us are also aware of current extinction threats and recent extinctions, but few, if any, of us understand the varying and complex circumstances under which extinction actually happens. It turns out that extinction and species survival are...
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