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Theories behind extinction of the dinosaur
Theories behind extinction of the dinosaur
Theories behind extinction of the dinosaur
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Scientists are still unbeknownst as to why exactly these dinosaurs - strong, unstoppable, and ginormous - met their end (SC10). Dinosaurs ruled the Earth during the Triassic, Jurassic, and Cretaceous periods (Bauer). This makes it difficult to fully understand how the dinosaurs did not survive extinction, but many scientists gravitate towards two hypotheses that disclose the annihilation of the dinosaurs. The first theory that paleontologists favor discussing is the theory that a celestial body crashed into the Earth and caused a worldwide climate change. Earth contains a sheet of rock that not only belongs to a period previous to the dinosaur extinction but also contains the mineral iridium. Scientists have been able to use iridium to back up this theory because it is a peculiar …show more content…
A person may ask themselves, “How did mammals survive the Cretaceous-Tertiary extinction, but not the dinosaurs?” Compared to dinosaurs, mammals are much more proficient at maintaining a specific body heat. They are also not as reliant on the climate’s temperatures. This made it much less painless for them to escape the heat and keep themselves cooled off. Mammals that lived in aquatic homes or lived in shelters beneath the sand were spared the intensified heat that was subsequent to the asteroid hitting Earth. Dinosaurs were entirely unprotected from the raging heat that was covering the surface (Switek). Any of them that were found to be out in the wide open would have instantaneously burned to their demise (Bascom). Similar to reptiles, dinosaurs were covered in a scaly skin and lived in environments that were barren, dry, and parched (Naish and Barrett). This made is even more difficult for dinosaurs to adapt to the ever-changing
The possibility if a meteor strike as the cause of extinctions is discarded, something that most specialists agree on. There is no evidence of any meteor crater big enough or recent enough to be accountable for it; there are no “elements that are common extraterrestrially but less so on Earth, such as iridium, and no sign of a tsunami or other phenomena following the impact.” The extinctions where also very selective and occurred over a very long period of time. If a “one shot” catastrophe had been the cause it would have affected all species at the same time and in similar
“Sex, Drugs, Disasters, and the Extinction of Dinosaurs” is written by Stephen Jay Gould, professor of geology and zoology at Harvard. This essay is one of more than a hundred articles on evolution, zoology, and paleontology published by Gould in national magazines and journals. It tells about scientific proposals for the extinction of dinosaurs – a confusing but an exciting problem that humanity tries to solve. By analyzing and describing each of the claims for the reptiles’ demise – sex, drugs, and disasters – Gould differentiates bad science from good science and explains what makes some theories silly speculations, while the other, a testable hypothesis.
It's hard to say that humans haven't had an impact on their environment. Climate change, for example, has been a hot issue in the developed world ever since evidence proving the existence of human-caused global warming was unleashed leading to an onslaught of theories regarding its potential effect on our future. But what impact did humans have thousands of years ago when they were first colonizing North America?
...ories of why dinosaurs went extinct abound, and as there is no theory yet to be truly confirmed as the “right one”, my theory of dinosaur cannibalism is also purely anecdotal. The discovery of the cannibalistic Majungatholus atopus in Madagascar is an important scientific find because it confirms a long-standing theory of cannibalism among certain carnivorous dinosaurs. Behavioral patterns of extinct animals are difficult to establish; however, these bones give authentication to previous unfounded beliefs about the ancient feeding practices of some dinosaurs.
He explores the theories that a rise in temperature could have made the reptiles of old infertile, or that the dinosaurs ate flowering plants that acted as drugs, causing the beasts to overdose. He goes on to examine a third theory, that of an asteroid hitting the earth and causing a cloud of smoke and dust to cover the sun, dropping temperatures and killing not only the dinosaurs, but much of the life that was present on the Earth at the time. Gould himself leans toward the last theory, citing evidence and research to back his point. All of this, he delivers with an air of humor, saying things such as “How can we possibly decide whether the hypothesis of testicular frying is right or wrong?” (par 21). While the theory of infertility of dinosaurs comes from the idea of rising heat, Gould’s wording here brings to mind a funny image rather than a worldwide epidemic. Using humor again, Gould says “If you talk just about asteroids, dust, and darkness, you simply tell stories no better and no more entertaining than fried testicles or terminal trips” (par 26). Not only does he cast aside the first two theories as useless frivolities, he sets the stage for proving why the asteroid theory is better, using humorous language to do so. A humorous essay such as Gould’s is fun to read, while keeping a basis in
We use dinosaurs to represent the changes in nature that have occurred throughout time. Studies found that although the “oldest rock did not show evidence of life, the progression of plant and animal life that changed in recognizable intervals, from ancient life, age of reptiles to the age of mammals” (Dino Nature Metaphor, slide 6), measured the age of the earth. When we think of dinosaurs in relation to nature, we think of that very powerful force that controls the cycle of life. Nature was able to yield such magnificent ferocious creatures that walked the earth and then take them back when they served nature’s purpose. Dinosaurs fit perfectly in nature’s constant
Neanderthal Extinction Neanderthals and modern humans coexisted for well over 100,000 years. Then suddenly Homo neandertalensis began to die out and surrender the earth to Homo sapiens. Paleontologists and anthropologists have entertained several possibilities for the causes of this event: interbreeding among Neanderthals and humans, competition for natural resources, and Darwin’s theory of “survival of the fittest.” What the real cause has been has plagued scientists for years. Now, due to an international research team from Germany, those possibilities have been even further deduced, making it easier to pinpoint the exact reason Homo neandertalensis became extinct.
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 the idea that dinosaurs were a warm blooded species. In this essay, I am going to give supporting evidence of dinosaurs being both warm and cold blooded. I will provide background information on the dinosaur that was discovered and what information it provides scientists.
Orphans are kids without parents. In some cases, these children never know their biological parents, or others deal with the heart-breaking separation. After reading the novel, A Single Shard a reader learns about the main character Tree-ear. He is a twelfth century orphan with a guardian who cares for him plus gives him love and affection from a young age. Ruckel is a more modern-day orphan, but he lives in an orphanage with a bunch of children. He is a twentieth century orphan, but does not a lot of attention from anyone; he is with other kids. As the reader can see, Ruckel and Tree-ear have some similarities and differences.
seems like it happened so sudden, as geologic time goes, that almost all the dinosaurs
Several mass extinctions have occurred during the Earth’s history. The Cretaceous – Tertiary Boundary (K-T) Extinction caused the loss of at least three-quarters of all species known at that time including the dinosaurs. The cause of this mass extinction is a controversial subject among scientists but the fossil evidence of it’s occurrence is abundant.
-Many dinosaur fossils have been found at high latitudes. Cold blooded animals tends to evolve warm regions to maintain their body temperature by using the environment. And higher latitudes entail colder temperature. Therefore it’s unlikely that dinosaurs were cold blooded. -Dinosaurs bones show evidence of endothermic metabolism.
The Jurassic period is known as one of the most interesting periods of time in earth’s history, mainly for the awe-inspiring creatures many of which have gone extinct, the most remarkable being the dinosaurs. Life in the ocean during this time was also extremely diversified and amazing for the creatures it beheld. The Jurassic occurred from 199.6 to 145.5 million years ago, following the Triassic Period and preceding the Cretaceous Period within the Mesozoic Era. The supercontinent of Pangea began to drift apart during this time. Right before the Jurassic period began, a major extinction event occurred wiping out much of the life on earth. The events that unfolded afterwards gave life to a new planet.
Some scientists believe that mammals out competed dinosaurs for food and other resources. The last theory that dinosaurs died due to a large amount of volcanism comes up in scientists list of theories as well. Many different theories of why dinosaurs went extinct include extinction by asteroid, mammals outcompeting dinosaurs, climate change and volcanism. The most popular theory of dinosaur extinction, the asteroid theory, says that dinosaurs died out because of a single, giant asteroid. They say that the asteroid that struck the earth near the Gulf of Mexico went 43,000 mph and spanned six miles wide (Erdman).
Biodiversity loss can lead to extinction, and hurt human life. It is our responsibility to take care of the environment. We bring in machines that harm the environment and destroy animal life. We need to limit ourselves on how much land and resources we consume. There are major issues that are causing species to become extinct and hurt our way of life and other animals do to the change in food chain.