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Dinosaurs
Dinosaurs are a prehistoric species that lived on Earth from 230 to 65 million years ago.
3,979 Questions
Was cyanobacteria the first to exist or dinosaurs?
Cyanobacteria.
Cyanobacteria are among the earliest forms of life and are thought to have evolved approximately 2.5 billion years ago. These bacteria are thought to have changed the atmosphere of the planet via nitrogen fixation. The first dinosaurs evolved approximately 250 million years ago during the late Triassic.
What dangerous dinosaurs were there in the Jurassic time period?
Some dangerous dinosaurs that lived during the Jurassic period include Allosaurus, a large predatory theropod dinosaur, as well as Ceratosaurus, Dilophosaurus, and Torvosaurus. These dinosaurs were apex predators and hunted other animals for food.
When was 4600 million years ago?
4600 million years ago would be around the time of the Hadean Eon, a period in Earth's history known for its intense heat and heavy bombardment by asteroids and comets. This was a time when the Earth was still forming and undergoing significant geological and environmental changes.
A dinosaur omnivore is a dinosaur that ate both plants and meat. One example of a dinosaur omnivore is the Oviraptor, which is believed to have had a diet that consisted of both plants and small animals.
How did dinosaurs die in the ice age?
There are many theories as to why the dinosaurs became extincy, ranging from climate changes, to loss of food supplies, to fatal diseases.
A prominent theory is that a large asteroid struck the Earth, throwing up a dust layer that blocked sunlight and caused most plants to die off. In the colder climate, and without their major source of food, the dinosaurs dwindled in population until there were not enough adults to maintain their species.
Did the dinosaurs extinct at once?
No, not all at once. Throughout the 150 million year "reign" of the dinosaurs, all kinds of groups of dinosaurs have flourished then died out. Dinosaurs living in the Triassic Period were not the same as dinosaurs living in the Cretaceous period. However, the final blow to the dinosaurs that caused them all to die out was the K-T mass extinction that occurred 65 million years ago.
When did turrasic dinosaurs die?
The largest extinction of animals commonly called dinosaurs was around 65 million years ago, in a time period known as the Cretaceous-Tertiary extinction event, which lasted somewhere from several to several thousand years (evidence is not determinate on the exact length of the event for several reasons, and above-mean rates of extinction persisted for quite some time). This view is supported by the vast majority of scientific evidence and knowledge.
Some dinosaurs did survive however, to become extinct at much later times, and others had gone extinct much earlier, so one could technically describe all of the last 230 million years as "when [the] dinosaurs became extinct".
There is a substantial number of scientists, however, who would say that, technically speaking, "the dinosaurs" did not become extinct at all, because one group is still with us: the birds. There is considerable evidence that birds are descended from a group of dinosaurs known as Maniraptora (see the related link below), which would indicate that birds are properly included within the dinosaur clade (group of organisms related by descent).
All the dinosaurs went extinct about 65 million years ago after a giant asteroid hit earth.
Most mammals during the Mesozoic were?
During the Mesozoic Era, most mammals were small, nocturnal, and likely insectivorous. They were overshadowed by larger reptiles like dinosaurs and did not become the dominant group of animals until after the extinction of the dinosaurs at the end of the Mesozoic.
Were all carnivore dinosaurs walk on two legs?
No, not all carnivorous dinosaurs walked on two legs. Some carnivorous dinosaurs, like the theropods, were bipedal, walking on two legs. However, others, such as the ceratosaurs, were quadrupedal, walking on four legs.
The first dinosaur was named by Sir Richard Owen, a British scientist, in 1842. He coined the term "dinosaur" to describe the ancient reptiles whose fossils had been discovered.
Did dinosaurs morph into early birds?
In all likelihood, yes. Their are mountains of evidence pointing to birds having a dinosaur ancestor.
Why do Scientists think a Asteroid hit the world 65 million years killed the dinos?
The main evidence is a layer of iridium that is found worldwide. Iridium is an element that is rare on Earth's surface, but is common in asteroids. The iridium layer dates to 65.5 million years ago, and coincides with the extinction of the dinosaurs. Also, geologists have discovered the Chixculub crater, a crater that is buried by sediment but is so large it could only have been created by an asteroid 6 miles across.
What evidence indicates that during the Late Triassic and Early Jurassic was arid?
The geology of the rocks from those times show that the climate was arid, although there were oases and even some swamp. Sandstone, for example, is a stone that is formed in dry, sandy areas. It is common in the Morrison Formation of western North America, dating to the Jurassic.
The Atlantic Ocean did not exist 250 millions ago during the Permian period?
During the Permian period 250 million years ago, all of the continents were massed together into one supercontinent, Pangaea. The Atlantic Ocean didn't form until Pangaea broke apart, with the Americas moving west and Africa and Europe moving east. That didn't begin until the late Jurassic, about 100 million years later.
Dinosaurs flourished during the Mesozoic Era due to favorable environmental conditions, abundant food sources, and the absence of large land predators. Their adaptations, such as size, reproduction strategies, and specialized features, also contributed to their success.
Why the plant life died at the end of Mesozoic era?
No major plant groups died out at the end of the Mesozoic. However, most of the individual plants died because dust that was launched into the atmosphere by the asteroid impact blocked out the sun. However, once the dust settled after a few months. dormant seeds took hold.
The processes of weathering and erosion, which were caused by wind, ice, and water, are responsible for exposing the dinosaur fossils at Dinosaur National Monument. Weathering is the process of rock being broken into sediments. Erosion is when those sediments are carried away by wind and water.
Why were so few dinosaurs found in Antarctica?
The reason that so few dinosaurs have been found in Antarctica is because it is almost impossible to dig for fossils on most of Antarctica. First, most if it is underneath a mile of ice. Secondly, because Antarctica is so harsh, few paleontologists go to dig even in the areas of rock that are exposed. To me, for those reasons, it's surprising that any dinosaurs have been found in Antarctica.
Why could climate change have killed the dinosaurs?
One hypothesis is that climate change from a massive asteroid impact led to a decrease in temperature and sunlight, disrupting the food chain and causing widespread extinction among plant and animal species, including the dinosaurs. This sudden change may have been too drastic for the dinosaurs to adapt to, leading to their eventual extinction.
What may have caused the first mass extinction 65 million years ago?
The leading theory for the first mass extinction 65 million years ago is a catastrophic event such as an asteroid impact. This event is believed to have led to environmental changes that caused the extinction of the dinosaurs and many other species.
Was Pangaea around in the Jurassic period?
Pangaea was around in the early Jurassic. However, it was already breaking up into a northern and a southern half. The former became Laurasia, and the latter became Gondwana.
The oldest fossil of dinosaurs occur in rocks that are approximstely how many million years old?
The oldest dinosaur fossils date from the Carnian stage of the Triassic period. That was around 220 million years ago. The first dinosaurs were small carnivores, like Eoraptor, and small, long necked herbivores called prosauropods.
What were Levels of CO2 in the cretaceous period?
The carbon dioxide (CO2) levels in the Cretaceous were 1,700 parts per million. That is 6 times the modern pre-industrial level (the amount of CO2 before the industrial revolution). The higher CO2 levels may have been partially responsible for the warm average temperature during the Cretaceous (4 C [7.6 F] above modern temperature).
What are some main things travelers would like to see during the Jurassic time period?
Dinosaurs
depending on the creationist or evolutionist theory, you would either see dinosaurs interacting with man, or dinosaurs interacting with nature. either way, you would see the most alien landscape possible on one planet. if you come up with a way to get back there, please post it so we can all follow for a quick view!!
Dinosaurs died in what geological period?
Dinosaurs died in the Cretaceous, Jurassic, and Triassic periods, but became extinct at the end of the Cretaceous.
