Expository Text on Dinosaurs

Expository Text on Dinosaurs

With the term "Dinosaurs" (from the Greek voices deinos, "Terrible", and sauros, "Lizard") we refer to a diverse group of prehistoric animals, whose existence we know through the numerous fossils found in the subsoil of almost all regions of the world.

Were the Vertebrate animals dominant on our planet for about 135 million years, from its origin in the Triassic period, approximately 243 million years ago, and their sudden massive extinction at the end of the Cretaceous period, 65 million years ago years.

Dinosaurs were sauropsid reptiles of very variable size, from species no bigger than a contemporary rodent, even true giants, among which are the most voluminous beings that have ever existed.

Similarly, they populated all the habitats available, from the landmass to the deep sea, and even soared through the skies. Thus, it was a highly diversified set of animals, of which around 500 genera and more than a thousand different species are already known.

What were dinosaurs like?

There is evidence of large quadruped dinosaurs, with long necks and long tails, which slowly roamed the land, feeding on the leaves high up in the trees, like the famous Diplodocus; but also terrible predators bipeds, with huge and powerful mouths, with serrated teeth, like the Tyrannosaurus; or true living tanks with a body protected by bony plates and spiny tails, such as the Ankylosaurus or the Triceratops.

The immense variety of dinosaur species that existed proliferated and diversified in a world much more hot and humid than today, and across a single existing supercontinent, known today as Pangea.

In addition, the oxygen-rich atmosphere of that time favored its growth and allowed its immense proportions. Initially it was thought that they were slow animals and cold bloodBut findings from the 1970s point to the opposite: active animals, high metabolisms and rich social interaction.

Since when is its existence known?

The first dinosaur fossils were discovered in the 19th century, before we had a better understanding of the geological history of the planet. The discovery of the remains of these ancient creatures forever revolutionized our understanding of the history of the planet and of life.

The discovery of these fossils showed that the world is much older than previously believed and that extinction is possible. that is to say, that the animals that accompany us today have not always existed, and that before them there were species that disappeared. This was at the time an important questioning of religious doctrines on the origin of life.

However, the massive and sudden disappearance of dinosaurs is a matter of study by paleontologists and other specialists, and there are different possible explanations for this.

The most famous theory is the one that maintains that a massive space object (such as a asteroid or meteor) impacted the Earth approximately 65 million years ago, causing a global climate catastrophe that extinguished not only dinosaurs but 75% of existing species.

Today it is known that birds they are the only species descended from dinosaurs, judging by the anatomical similarities between prehistoric fossils and many of these present-day animals.

At the same time, dinosaurs were an important evolutionary step in the rise of the mammals warm-blooded prehistoric, of which the present human being is a very remote relative.

What is an expository text?

A expositive text It is a type of writing whose essential mission is to provide the reader, in an objective way, specific and specific information on a specific topic.

It differs from other text types, such as argumentative text or the narrative text, since the expository text does not contain arguments or opinions in favor of a perspective, nor does it contain any kind of story or narration.

Are texts in which data, observations, textual citations and other resources predominate in order, as the name implies, to expose the reader to an aspect of reality.

Follow with:

References:

• "Expository text" in Wikipedia.
• "Dinosauria" in Wikipedia.
• "The expository text and its functions" in Educate.
• "What is a dinosaur and how does it differ from other prehistoric reptiles" in National Geographic.
• "What are Dinosaurs?" on National History Museum (United Kingdom).