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Theory of extinction of dinosaur
Theory of extinction of dinosaur
Theory of extinction of dinosaur
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The prominent theory is that dinosaurs died in a fiery death due to an asteroid crash on Earth, but is that really what caused their mass extinction? Every scientist has a theory, and with so many out there it was hard to just pick one, they all made sense. It is completely possible for a volcano to have killed the dinosaurs, or even an asteroid. Another popular theory was the ice age. These were all plausible reasons for the extinction of dinosaurs, and that’s when the combination theory was discovered. It is a theory that states there were several factors that played into the extinction of the dinosaurs. The dinosaurs died due to the environmental factors that are included in the combined theory. Dinosaurs are prehistoric animals that lived long before humans existed. As …show more content…
However, while the armored dinosaurs were gentle creatures, the raptors were anything but gentle. Raptors were among the most feared dinosaurs of the Mesozoic Era. Raptors “had sickle-shaped talon on the second toe of each foot. They normally kept these talons off the ground like folded switchblades, and used them as hooks to keep their prey from escaping (similar to modern birds of prey)” (Castro). The last popular dinosaur that roamed the ancient world will be Pterosaurs, or the Pterodactyl. This is a winged dinosaur that first appeared in the late Triassic period and stayed until the end of the Cretaceous period. There are numerous kinds of dinosaurs that roamed the earth countless of years ago. Dinosaurs are a type of reptile that became extinct. Exactly how they became extinct remains a mystery. Scientists have been arguing their many theories for years. There are several theories that have real evidence supporting its ideas. However, one theory that has direct evidence from dinosaur fossils is the volcano
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
Ceratopsians and Pachycephalosaurs Around 144 million years ago, began the emergence of the Ornithischian dinosaurs during the Cretaceous period and diversified into North America and Asia. Ornithischians were classified as having a hip structure similar to that of birds, although they are not the descendants of birds. Marginocephalians, meaning "fringed heads" are a group of Ornithischians that have a distinctive skull structure, consisting of a slight shelf or bony frill on the back of the skull, a unique palate, and a short hip structure. These herbivores include two major groups: the Ceratopsians and the Pachcephalosaurians. These plant-eaters include the Ceratopsians, horned dinosaurs such as the Triceratops, Styrachosaurus, Pentaceratops, and the Protoceratops.
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.
Paul, Gregory S. (2002). "Looking for the True Bird Ancestor". Dinosaurs of the Air: The Evolution and Loss of Flight in Dinosaurs and Birds. Baltimore: Johns Hopkins University Press. pp. 171–224. ISBN 0-8018-6763-0.
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?
The Permian-Triassic Extinction is a mass extinction that occurred between the Permian and Triassic geologic time periods approximately 250 million years ago; it is the deadliest of all extinctions that have occurred on Earth. In addition, during the Permian-Triassic extinction the continents of today existed as one supercontinent known as Pangaea. This was the first time in history where continental or land mass exceeded that of the ocean. This was also before dinosaurs of the Triassic period roamed Earth, during this time animals such as the therapsids, and Synapsids such as the Pelycosaurs, insects and amphibians also occupied Earth. Fauna that existed during the Permian period includes Gymnosperms, or seed producing plants such as the Conifers. Other animals that existed during this time include marine life such as brachiopods (clams), bryozoans (coral-like skeletons), bony fish and sharks, as well as crinoids (sea urchin like creatures). According to National Geographic, about 90 percent of all the animals and fauna of this period perished, the marine life was hit the hardest wi...
and smaller prey to avoid injury. Sometimes the spino would even find a dead animal and start to eat it. Later on other dinos would catch the scent of the carcass and track it down only to find a large predator (the spino) eating it. If hungry enough a fight would break out between the two predators over the carcass. This leads to injuries which could lead to infection and death. The Spinosaurus was too specialized for swamps and other water based environments. When the water dried up, the spino even with it’s varietal appetite, could not survive long without its correct ecosystem.
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
The dramatic changes in climate that resulted from this huge collision were too much for the dinosaurs. They were not able to survive. Another theory that could explain how the dinosaurs became extinct is volcanic activity. A huge increase in volcanic activity at around 65 millions years ago could have pumped so much ash into the air that it blocked out the sun killing the dinosaurs. Some scientists believe that there was a severe ice age.
When I started this paper, I had many questions. I wanted to know what all the main theories of dinosaur extinction are and how many there are. I also wanted to know what factors in each theory would have killed these massive beasts. Other questions I had are: had dinosaurs been dying out before the event? Did any dinosaurs survive the Cretaceous/Tertiary (K/T) event? What religious beliefs contradict the dinosaurs’ very existence? The last question I wanted to address was whether or not an event such as this one could happen to us? After five papers and hours of research, some of the new questions I have are: what happened after the Cretaceous/Tertiary event? I would also now like to know if one of these theories could happen to us and how we would be able to handle it. I came up with these questions because I wanted to know we are living with this present danger. Whether a huge ice age could eradicate an entire population of humans is mind-boggling and would be extremely interesting to research. To come up with these new questions, I let my brain wander. I was joking a...
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.
The cause of the mass extinction is not known for certain, but the lineage of animals that led to the dinosaurs, along with some other groups, survived. This great extinction marked the end of the Paleozoic, one of the great geological divisions of time. The Mesozoic era that followed it was to see the evolution of the dinosaurs themselves. The Mesozoic is divided into three 'periods' of geological time when the dinosaurs lived. These periods are the Triassic, Jurassic and Cretaceous. (Boulton,
In the third instalment of Jurassic Park, was a real swing and miss when it came to knocking it out of the ball park. With no spectacular or miraculous happenings to make the film truly stand out. The only contending players worthy of keeping a look out for being the Velociraptor’s, who were the films saving grace and true MVP’s.
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.