Dinosaurs Essay Dinosaurs Essay Writing Dinosaurs essay writing focuses on the age of dinosaurs, also called Mesozoic Era, which started about million years ago. These types of archaeology papers tend to discuss the evolution and origin of dinosaurs and their species See age essays. Dinosaurs essay usually cover three periods:
Dinosaur is the name of large extinct reptiles of the Mesozoic Era, during which they were the dominant land animals on Earth. The term was proposed as a formal zoologic name in by the British anatomist Sir Richard Owen, in reference to large fossil bones unearthed in southern England.
The various kinds of dinosaurs are classified in two formal categories, the orders Saurischia and Ornithischia, within the subclass Archosauria.
The first recorded dinosaur remains found consisted of a few teeth and bones. They were discovered in in Sussex, England, by an English doctor, Gideon Mantell, who named them iguanodon.
About the same time, other fossil teeth and bones were found near Oxford, England, by Rev. These were named Megalosaurus.
Thousands of specimens have since been discovered nearly worldwide. Different types of dinosaurs varied greatly in form and size, and they were adapted for diverse habitats.
Their means of survival can only be identified from their fossil remains, and some identifications are in dispute.
They ranged in weight from 4 to 6 lb. Most dinosaurs were large, weighing more than 1, lb. Most were herbivores, but some saurischians were carnivorous. The majority were four- footed but some ornithischians and all carnivores walked on their hind legs.
Always classified as reptiles, dinosaurs have traditionally been assumed to have been reptilian in their physiology, cold-blooded, and ectothermic. In recent years several different lines of evidence have been interpreted as indicating that dinosaurs may have had warm blood and high rates of metabolism, comparable to birds and mammals.
Evidence supporting this view includes upright posture and carriage; mammallike microscopical structure of bones; skeletal features suggestive of high activity; and specialized food-processing dentitions and low ratios of dinosaurian predators to prey animals, both suggesting high food requirements.
The evidence is not conclusive--all the facts can be alternatively explained--but some dinosaurs may have been endothermic. The reproductive means of most dinosaurs is as yet unknown. Fossil eggs, attributed to one of the horned dinosaurs and a sauropod, have been discovered in Mongolia and France.
Fragments that are presumed to be of dinosaur eggs have also been found in Brazil, Portugal, Tanzania, and in the United States, Colorado, Montana, and Utah. In Montana, Utah, and Alberta, Canada, fossils of unhatched dinosaur eggs have been discovered. This evidence indicates egg- laying reproduction in dinosaurs, like most modern reptiles.
A few scientists believe that some dinosaurs may have given birth to living young, but no conclusive evidence has yet been found to support this. The two orders of dinosaurs are distinguished by numerous features, the most diagnostic being the arrangement of the three bones of the pelvious.
In saurischians, these bones were arranged in a triradiate pattern similar to that of modern crocodilians and lizards; the term Saurischia means lizard hip. The ornithischian pelvis was usually rectangular or tetraradiate; hence the name, which means bird hip.
During the million-year reign of the dinosaurs, many new varieties evolved and older kinds died out. Not all kinds became extinct at once; but the last of the dinosaurs disappeared at the end of the Cretaceous.
Many other animal kinds died out at about the same time, including the ichthyosaur, mosasour, plesiosaur, flying reptile, and a variety of lower organisms. What brought about such widespread extinction among so many different kinds of organisms is not known; it must, however, have involved major changes in the environment.Dinosaurs essays Something happened 65 million years ago, at the end of the Cretaceous period, something so devastating that it altered the course of life on earth.
It seems like it happened so sudden, as geologic time goes, that almost all the dinosaurs living on earth disappeared.
So how did the. - The Significance of Dinosaur Art Dinosaurs are creatures that seem to fascinate humans, since all we have left are their fossils. Although, through art, their bodies can be put back together and we have a better sense of what they looked like.
The huge extinct animals -- dinosaurs-- are classified as reptiles, and their time is called the Age of the Reptiles. It was supposed that in this early age no mammals existed; then skeletons of small wolf-like animals were discovered together with the bones of dinosaurs.
Dinosaurs' fossils have been known since at least , Types of Dinosaurs: While the imaginary of storywriter seems to center around one type of Dinosaurs, scientists have discovered from study of various types of fossils of Dinosaurs that Dinosaurs evolved into many sizes and shapes.
3/5(3). Dinosaurs And Birds - Dinosaurs and Birds Are birds really dinosaurs or are they simply related. That is a question that has gained new life in recent years due to the overwhelming facts the are pouring in from newly found fossils and studies from fossils that have been found in the past.
The Demise of the Dinosaurs Essay Sample. Introduction. The dinosaurs were the dominant vertebrate animals on the planet earth for over million years, from the late Triassic period, about million years ago, to the end of the Cretaceous period, 65 million years ago, when most of them became extinct in the Cretaceous–Tertiary extinction event.