“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.
Any hypothesis, Gould says, begins with the collection of facts. In this early stage of a theory development bad science leads nowhere, since it contains either little or contradicting evidence. On the other hand, Gould suggests, testable proposals are accepted temporarily, furthermore, new collected facts confirm a hypothesis. That is how good science works. It is self-correcting and self-developing with the flow of time: new information improves a good theory and makes it more precise. Finally, good hypotheses create logical relations to other subjects and contribute to their expansion.
The disaster theory, Gould claims, is an example of good science. It has testable evidence and has an impact on studies in other fields of science, it develops further and explains why the extinction of dinosaurs occurred simultaneously with other events. This theory suggests that a large comet hit the Earth sixty five million years ago, causing the cloud of dust to rise into the sky and to block sunlight. As a result, world temperatures went down significantly, the ice age bega...
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...r optimum temperatures, hot climate caused the dinosaurs to heat up beyond their optimum. However, the heat didn’t kill them, but sterilized the males, because their testes functioned at certain temperatures. Gould argues that this theory is untestable, and the experiments with the influence of extreme temperatures on modern alligators do not necessarily explain the extinction of dinosaurs. Furthermore, many questions are not answered because of the absence of evidence. Gould states that this theory is another example of bad science.
Sex, drugs, and disasters are both popular topics that grab public attention and scientific theories of the extinction of dinosaurs. While sex and drug hypotheses represent silly speculations, the disaster claim is good science: it provides testable evidence, has an impact on other scientific fields, and generates continuous research.
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
The question of what caused the extinction of megafauna during the Late Pleistocene period is one that archaeologists have struggled to answer for decades, but why should it matter? Discovering with certainty the cause of megafaunal extinction would simultaneously prove or disprove any of the proposed implications of each existing theory regarding this massive extinction.
The biggest mass extinction of the past 600 million years (My), the end-Permian event (251 My ago), witnessed the loss of as much as 95% of all species on Earth. Key questions for biologists concern what combination of environmental changes could possibly have had such a devastating effect, the scale and pattern of species loss, and the nature of the recovery. New studies on dating the event, contemporary volcanic activity, and the anatomy of the environmental crisis have changed our perspectives dramatically in the past five years. Evidence on causation is equivocal, with support for either an asteroid impact or mass volcanism, but the latter seems most probable.
The chapter of life which saw the rise of the dinosaurs is one of the most fascinating periods in our earth’s history. It is often the subject which brings about young children’s first exposure to science. When these children learn about these intriguing prehistoric beasts, one of their primary inquiries concerns the cause of their annihilation. What could have led to the demise of all those creatures, who lived very successfully for millions of years? This question has plagued experts and curious children alike for decades. In the early 1990s, a “smoking gun” was discovered – purported to solve the mystery of how the dinosaurs met their fate. This discovery was the Chicxulub crater in Yucatan, Mexico. The claim was that this 180 kilometer crater was the impact scar left by an asteroid that collided with the earth. The asteroid was so large and landed with such force that it effectively ended the dinosaurs reign over the earth. However, recent evidence and research reported in Proceedings of the National Academy of Sciences suggests that this could not have been the case, because the Chicxulab crater predates the mass extinction by roughly 300,000 years. Rather, the evidence suggests that two or more impacts caused the mass extinction experienced by dinosaurs.
The Permian-Triassic extinction occurred around 252 million years ago, causing the end of about 96% of marine life and around 70% of terrestrial vertebrate life that existed at that time (Lecture 29. slide 5). Overall, the event caused 83% of all genera to go extinct. This event led to an incredibly long recovery period that took millions of years for life to regain a sense of biodiversity. While many niches in the terrestrial ecosystem were left empty, they eventually were filled by surviving creatures that adapted and evolved. The extinction event is suggested to have lasted over the course of millions of years, with different genera going extinct at different times.
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
Yoon, C. K. (2002, May 21). Stephen Jay Gould, 60, is dead; Enlivened evolutionary theory. The New York Times. Retrieved from http://www.nytimes.com/2002/05/21/us/stephen-jay-gould-60-is-dead-enlivened-evolutionary-theory.html?src=pm&pagewanted=1
Typically, when an individual browses through various newspapers or watches the evening news they are most likely to see or hear some new and groundbreaking news concerning a scientific breakthrough. As I was looking through various scientific journals I came across an article that caught my eye for numerous reasons, but one in particular. The heading of the article read, “Cannibal dinosaurs revealed by tooth marks.” These prehistoric creatures that have been viewed by the public for centuries as being wild and ferocious beasts, are presently being seen more then just that. Recent evidence originating in Madagascar is leading researches in the direction that dinosaurs consumption of food did not strictly adhere to the food chain but instead fed amongst their own kind.
The sex theory is based on the speculation that male dinosaurs became sterile. Gould states, “testes function only in a narrow range of temperatures (those of mammals hang externally in a scrotal sac because internal body temperature 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.”(49).Gould indicates that the sex theory is restrictive because science cannot test if this speculation is right or wrong. Gould states, “how could we possibly decide whether the hypothesis of testicular frying is right or wrong? We would have to know things that the fossil record cannot provide…testicles simply don’t fossilize and how could we infer their temperature tolerance even if they did? In short, Cowell’s hypothesis is only an intriguing speculation leading nowhere.”(53). Gould also says that “it’s difficult to advance any definite arguments against” the theory of sex (53). This theory cannot be scientifically furthered. Therefore, the theory of sex is restrictive to the reason of dinosaur extinction due to its inability to provide adequate
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.
The most significant event of the Cretaceous era came at its end. Nearly 65 million years ago, the second most severe mass extinction in earth’s history occurred. This resulted in the loss of around 80% of species living at the time. Though nowhere near as severe as the end-Permian mass extinction, the end-Cretaceous extinction is the most well known mass extinction event. This is due to the violent event that caused it the extinction, as well as the chapter of earth’s history that it closed: the Dinosaurs. The Cretaceous Event ( often shortened to K-T event) Of the animals that were killed off were the flying reptiles (pterosaurs) and the last few mosasaurs and plesiosaurs, both early marine reptiles. Many mollusks and species of microscopic plankton were killed. Terrestrial plants suffered mass extinction as well. Almost 60% of terrestrial plants were lost. This led to high extinction rates among insect populations, especially insects that were highly specialized to feed on just a few types of plants had it the worst. It took approximately 9 million years for the global insect populations to recover from the Cretaceous extinction. Immediately after the extinction, the earth saw an explosion of short term species who respond well to fire, or other external disturbance. Evidence of the catastrophe comes from a thin rock layer deposited worldwide just after the impact. It is dominated by fossil plants whose descendants recover quickly after fires of other disturbances, such as Fire Weed in Alaska. The causes of the Cretaceous extinction are still being debated by paleontologists. Scientists agree that the main cause of the extinction was a...
Sutter, John D. “Should scientists ‘Jurassic Park’ extinct species back to life”, www.cnn.com 5 May 2014, 22 May 2014
...pdated 1995, accessed 3 Sept. 2000), Dino Buzz – What killed The Dinosaurs ? – Current Arguments,
When a paleontologist makes a discovery about Dinosaurs it is usually a celebrated event and will appear on all sorts of covers of magazines and even newspapers, with good reason. These discoveries are often quite exciting for a few reasons. The whole experience of finding a fossil that is hundreds of millions of years old is quite an adrenaline rush, but the fact that each discovery has the ability to answer questions in relation to evolution is quite amazing. Each finding of Dinosaur remains can help answer questions of how that certain species evolved from another. If our species can fully understand how Dinosaurs evolved, maybe in the future we can learn something about our evolution. Without discoveries from the past how is our society supposed to persevere and learn from mistakes that may lead to our own extinction, and who to learn better from than perhaps the dinosaurs that have gone through many stages of evolution and have faced extinction.
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).