Wait a second!
More handpicked essays just for you.
More handpicked essays just for you.
theory of extinction of dinosaur
theory of extinction of dinosaur
theory of extinction of dinosaur
Don’t take our word for it - see why 10 million students trust us with their essay needs.
Recommended: theory of extinction of dinosaur
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
“...99.9 per cent of all [species] that have ever existed are now extinct.” (Benton 1) After one hundred and sixty million years of domination, the reign of the dinosaurs ended in fire and ice. Sixty five million years ago, the largest volcanoes in the history of the Earth erupted across what is now India, effectively annihilating the dinosaurs by spewing out noxious gas and ash, that effectively blocked out the sun killing off most vegetation and breaking the food chain, leaving the dinosaurs to starve. Compared to other groups of animals the dinosaurs were the most vulnerable to such a climatic event and the result was the end of the dinosaurs’ glorious evolutionary history.
The specific/primary cause for the Permian-Triassic Extinction event is still in contention by several researchers, but is generally agreed on to be the result of several ‘pulses’, or miniature...
Dinosaurs held their own, according to studies, for at least 150 million years. After becoming extinct and finding fossilized remains dinosaurs have become a way in which we not only measure the changes that have occurred as the planet evolved, but also how we express ourselves today.
In the essay “Sex, Drugs, Disasters, and the Extinction of Dinosaurs” scientists come up with several theories of how the dinosaurs could have possibly become extinct. They tell three of the leading theories as to how they think the dinosaur era extinction happens. The whole thing is a big conspiracy. These theories are government cover-ups to keep us from knowing things. The government knows things that they don’t want us to know, but I already know what happened. The extinction of the dinosaurs are the effect of alien activity on and around Earth.
...ll. This group still remained successful during the Jurassic period and had a wide geopraphic distribution. Other reptiles evolved to not only live on land, but to fly. The earliest known birds appeared during this period; Archaeoteryx being the first to be considered the intermediate between the birds and predatory dinosaurs. It is debated on whether this ancient bird could actually fly or merely glid from tree to tree. Carnosaurus, meaning “meat-eating” is another group of dinosaurs that ruled during the Jurassic. With such large herbivorous prey animals, the correlation of these large predators make sense of why they were so common. An Allosaurus was one of the most common Carnosaurs in North America. Upon finding numerous intact skeletons in fossil beds, it has been reported that the Allosaurus was superficially similar to the later evolving Tyrannosaurus rex.
The Extinction of Dinosaurs How did the dinosaurs become extinct? This is a question that has stumped scientists ever since dinosaur fossils were first discovered. There are many theories as to how the dinosaurs became extinct. This page presents some of the most popular theories. Keep in mind that there is no absolutely proven theory.
During the Permian, reptiles populated the land. At this time, most of the continents were at high, rather cold latitudes. The 'mammal-like' reptiles (pelycosaurs) included such well known forms as the 'sail backs' Dimetrodon and Edaphosaurus (up to 3m long) and were the most common tetrapod in the Early Permian fauna. Other groups living at this time include the therapsids, which were a diverse group including Moschops (up to 5m long) and Dicynodon. It is important to realize that the lineage of animals that eventually led to the dinosaurs (known as the diapsids) were rare in the Carboniferous and Permian - they showed no sign of their later rise to dominance. They included forms such as Protorosaurus, and the remarkable Coeleurosauravus that was able to glide from tree to tree using skin covered ribs in a similar way to the modern 'flying lizard' (Draco).
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...
It could have been a comet or an asteroid that hit the dinosaurs and ended the life of dinosaurs. If a comet's killed them it will not happen in an fast time lapse
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.
It is widely agreed that such an object asteroid 10 kilometers across struck just off the coast of the Yucatan Pennsylvania 66 million years ago. According to scientists who maintain the dinosaur extinction came quickly, the impact must have spelled the cataclysmic end. For months, scientists conclude, dense clouds of dust blocked the sun’s rays darkening, and chilling Earth to deadly levels for most plants and, in turn, many animals. Then when the dust finally settled, gases created by the impact caused temperatures to rise above pre-impact levels. In a few years to this hypothesis these frigate and sweltry climatic extremes caused the extinction of not just the dinosaurs, but up to 70 percent of all plants and animals living at the time.
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.
Reptiles are vertebrate, or backboned animals constituting the class Reptilia and are characterized by a combination of features, none of which alone could separate all reptiles from all other animals.The characteristics of reptiles are numerous, therefore can not be explained in great detail in this report. In no special order, the characteristics of reptiles are: cold-bloodedness; the presence of lungs; direct development, without larval forms as in amphibians; a dry skin with scales but not feathers or hair; an amniote egg; internal fertilization; a three or four-chambered heart; two aortic arches (blood vessels) carrying blood from the heart to the body, unlike mammals and birds that only have one; a metanephric kidney; twelve pairs of cranial nerves; and skeletal features such as limbs with usually five clawed fingers or toes, at least two spinal bones associated with the pelvis, a single ball-and-socket connection at the head-neck joint instead of two, as in advanced amphibians and mammals, and an incomplete or complete partition along the roof of the mouth, separating the food and air passageways so that breathing can continue while food is being chewed. These and other traditional defining characteristics of reptiles have been subjected to considerable modification in recent times. The extinct flying reptiles, called pterosaurs or pterodactyls, are now thought to have been warm-blooded and covered with hair. Also, the dinosaurs are also now considered by many authorities to have been warm-blooded. The earliest known bird, archaeopteryx, is now regarded by many to have been a small dinosaur, despite its covering of feathers The extinct ancestors of the mammals, the therapsids, or mammallike reptiles, are also believed to have been warm-blooded and haired.
Many different theories exist as to why the dinosaurs went extinct. We know for sure most dinosaurs died out around 65 million years ago. The majority of scientists agree on a number of theories as to what brought the end of the dinosaurs. The most popular theory is that an asteroid ended the reign of the dinosaurs. Another theory, massive climate change in the pre-historic atmosphere, caused all the dinosaurs to die. 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.