write a short story about dinosaurs how they live how they did.
Answers
Answer:
Dinosaurs are a diverse group of reptiles[note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 233.23 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201.3 million years ago; their dominance continued throughout the Jurassic and Cretaceous periods. The fossil record shows that birds are modern feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch, and are the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event approximately 66 million years ago. Dinosaurs can therefore be divided into avian dinosaurs, or birds; and the extinct non-avian dinosaurs, which are all dinosaurs other than birds.
Explanation:
Dinosaurs are a varied group of animals from taxonomic, morphological and ecological standpoints. Birds, at over 10,700 living species, are among the most diverse group of vertebrates. Using fossil evidence, paleontologists have identified over 900 distinct genera and more than 1,000 different species of non-avian dinosaurs. Dinosaurs are represented on every continent by both extant species (birds) and fossil remains. Through the first half of the 20th century, before birds were recognized as dinosaurs, most of the scientific community believed dinosaurs to have been sluggish and cold-blooded. Most research conducted since the 1970s, however, has indicated that dinosaurs were active animals with elevated metabolisms and numerous adaptations for social interaction. Some were herbivorous, others carnivorous. Evidence suggests that all dinosaurs were egg-laying; and that nest-building was a trait shared by many dinosaurs, both avian and non-avian.
While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species, and some were able to shift between these stances. Elaborate display structures such as horns or crests are common to all dinosaur groups, and some extinct groups developed skeletal modifications such as bony armor and spines. While the dinosaurs' modern-day surviving avian lineage (birds) are generally small due to the constraints of flight, many prehistoric dinosaurs (non-avian and avian) were large-bodied—the largest sauropod dinosaurs are estimated to have reached lengths of 39.7 meters (130 feet) and heights of 18 m (59 ft) and were the largest land animals of all time. The misconception that non-avian dinosaurs were uniformly gigantic is based in part on preservation bias, as large, sturdy bones are more likely to last until they are fossilized. Many dinosaurs were quite small, some measuring about 50 centimeters (20 inches) in length.
The first dinosaur fossils were recognized in the early 19th century, with the name "dinosaur" (meaning "terrible lizard") having been coined by Sir Richard Owen in 1841 to refer to these "great fossil lizards". Since then, mounted fossil dinosaur skeletons have been major attractions at museums worldwide, and dinosaurs have become an enduring part of popular culture. The large sizes of some dinosaurs, as well as their seemingly monstrous and fantastic nature, have ensured their regular appearance in best-selling books and films, such as Jurassic Park. Persistent public enthusiasm for the animals has resulted in significant funding for dinosaur science, and new discoveries are regularly covered by the media.
Answer:
The great dinosaur mystery
For over 150 million years the Earth was dominated
by some of the most extraordinary creatures that ever
lived the great reptiles, popularly known as the
dinosaurs. The name 'dinosaur, first introduced by
zoologist Richard Owen, is Greek for 'terrible lizard'.
though dinosaurs were not true lizards. Whilst most
dinosaurs were vegetarians, the few flesh-eaters were
indeed terrible. So why, from having been the lords of the
Earth 65 million years ago, did the dinosaurs suddenly die out, leaving the world to the smaller mammals?
Scientists have made several attempts to
resolve the riddle. Did the climate change?
Did certain smaller animals take to eating
the dinosaurs' eggs? Did a nearby exploding
star shower the Earth with deadly X-rays?
Some doubted an answer would ever
be found.
Then, about twenty years ago, some very rare
material, iridium, was found in rocks about
65 million years old. Where did it come from,
and could it be significant that it first appeared
just when the dinosaurs died out?
Scientists now believe that the most likely
origins of the iridium was outer space, and that
it probably arrived as part of one or more large
meteorites which collided with Earth. The
craters caused by these meteorites have now
been worn away, but some are more recent,
such as those in the picture, and can still be
seen today.
But how could something striking the Earth
65 million years ago have killed all the dinosaurs?
The theory is that if the object had been
big enough it could have caused such a
devastating impact that it would have thrown
enormous amounts of rock and dust high into
the atmosphere.
The dust would have spread round the world,
cutting out much of the sunlight. For months
or even years there would have been little
light and heat. It would have been rather like a
permanent extremely cold night.
Plants would have died and then the animals
that lived on the plants would have starvedio
Small animals might have been able to survive
by nibblingii bark or seeds, or even the frozen
bodies of larger animals. But by the time the
skies had cleared and the warmth and light
from the sun shone through again, it would
have been too late for the dinosaurs.