The word "dinosaur" means "terrible chameleon". But dinosaur is a large vertebrate of the extinct stream. They are the prehistoric inhabitants of the earth's ecosystem. Scientists estimate that they ruled the earth for 160 million years. The first dinosaurs evolved approximately 230 million years ago. But a catastrophic natural disaster about 65 million years ago, at the end of the Cretaceous, completely wiped out the dinosaurs. [Although taxonomists theorize that modern birds are the descendants of theropods "dinosaurs.
# Features:
Dinosaurs are basically bipedal animals. But originally four-limbed species have been found. Dinosaurs sometimes used two or four legs when needed. Dinosaurs belong to the genus Reptiles. Although dinosaurs have similar characteristics to current reptiles, there is no similarity in activity.
Living in groups, for self-defense, migration or to ensure the safety of the cubs.
One species of dinosaur was also able to fly, such as theropod dinosaur. Although many do not believe. In a 2006 article in the online journal Place Wayne, scientists described "Aerostatic Rio choleradensis", whose skeletons provide evidence of a bird-like respiratory system in the body of a dinosaur. "
World: Animal world
Episode: Cordata
Episode: Vertibrata
Class: Saropsida
Subcategory: Diapsid
Subcategory: Archosromorpha
Genus: Dinosaur
# Dinosaur_size:
Many people think of dinosaurs as large animals. But there is no basis for the size of dinosaurs to be large. Reason: - Saropada dinosaur had a huge body which was 56 meters (190 feet). And the dinosaur called "Gizianikas" is only 50 cm (about 20 inches) long.
# Dinosaur_extension_cause:
There are two main reasons behind the extinction of dinosaurs. Namely: 1) Cosmic collision 2) Deccan Trap
Cosmic collisions: In 1960, scientist Walter Alvarez and his colleagues developed the theory of asteroid collisions, in which the extinction of dinosaurs is thought to be the result of a supermassive meteorite collision with the Earth. Which happened 68 million years ago. Alvarez and contemporary workers attest to the presence of excessive levels of iridium in the layers of contemporary rocks obtained from around the world. After this collision, the temperature of the Earth's atmosphere increased abnormally, which was local for a long time.
Deccan Trap: All the doctrines that preceded the Deccan Trap until 2000 AD, in connection with the extinction of the basalt flooding, agreed on one thing: extinction occurred gradually. This is because the southern basalt flooding started 68 million years ago today and has been going on for 2 million years.
Alvarez also speculates that declining sea levels and the creation of southern plateaus through gradual eruptions may have been catalysts for extinction.
nicely done.. good article