Dinosaurs

Mammals did not evolve from dinosaurs.

Birds branched off from a group of dinosaurs called theropods, the two-legged carnivores that included T. rex and Velociraptor. Even before birds evolved many theropods already had feathers, probably for insulation. From here there are two main hypotheses about how these dinosaurs evolved into birds.

First is the "ground up" hypothesis, which proposes that small theropod dinosaurs held their arms out in chasing prey such as insects. Certain arrangements of feathers might have allowed them to run faster or lighter, which became enhanced as the arms became precursors to wings. This then gradually transitioned into "wing" aided jumping, then gliding, and finally true flight.

Second is the "trees down" hypothesis. It proposes that small, tree-climbing theropods that jumped from branch to branch were able to use their feathers on their arms and legs for gliding, this gradually developed into true flight. Fossils that may match this description have been found.

I am guessing you are asking why dinosaurs went extinct. Scientists have not come to a conclusion as to why they went extinct. However, there are many theories which could answer your question. Some scientists believe that dinosaurs went extinct because of a large meteor which could have crashed into the earth and wiped out any exposed animals. There is also a theory that the weather changed for the worst, causing dinosaurs to die. Although there is no agreed answer to your question, it is up to you to decide why exactly they went extinct.

Archaeopteryx reproduced by laying eggs, shown by fossils.

Dinosaurs lived for over 160 million years from the late Triassic period (about 230 million years ago) to the end of the Cretaceous. Dinosaurs were animals, therefore they did not wear any type of garment- including pants.

because of the insects that came after heavy rain

160 million years

Spinosaurus, Stegosaurus erm cnt fink of ne more but derz 2?

There's a tentative creature called Ultrasaurus, which, if it doesn't turn out to be (when more bones are found) just a really big brachiosaur, would be the tallest dinosaur yet described.

Cenezoic

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i dont really think they lived in a swamp. maybe around it but like i dont think they actuly lived in a swamp

Many organisms survived or there would no longer be life on Earth. Microbes were mostly unaffected, as were insects. Other survivors include fish, crocodilians, birds, lizards, turtles, amphibians, and mammals.

The most commonly accepted hypothesis is that an asteroid, 6 miles in diameter, crashed into what is now the Yucatan Peninsula 65.5 million years ago. It threw enough dust and ash into the atmosphere to block out sunlight for months or years. Without sunlight, plants died, and without plants, the animals that depended on them died.

For a few million years prior to the impact, climate change caused by excessive volcanic activity in India's Deccan Traps had reduced worldwide biodiversity dramatically, including the number of dinosaur species. Some scientists believe that this climate change was responsible for their extinction.

The dinosaurs died out 65.5 million years ago. That was the end of the Mesozoic era.

It is not certain that climate change killed the dinosaurs. It is likely that several factors combined. Temperatures though rose by around 10°C between the Early and Middle Cretacious Period. This could have been caused by a huge asteroid impact. It could also have been caused by extreme volcanic eruptions in the area of India and Pakistan.

There was great climate change in the Late Cretacious Period. Continental movement and volcanic eruptions made many changes. Sea levels fell and tropical vegetation was replaced by woodlands. If the vegetarian dinosaurs' food supply failed, then the food chain would affect the meat eaters too.

So far, Herrerasaurus is among the earliest known Dinosaur

Fossil records is the information gathered about living things that are now extinct. Scientists use information gathered on and around fossils to determine things like size, mating rituals, and behavior of extinct animals.

pterodactyl?

Ornithocheirus

No, dinosaurs reproduced sexually. No vertebrate animals reproduce asexually.

Yes, Utahraptor was a real dinosaur from the Cretaceous period. It was a realtive of velociraptor.

mr. djw studies dinos

The dinosaur age is known as the Mesozoic era. It is divided into three periods, the Triassic, the Jurassic, and the Cretaceous. Each of those is further divided into stages. There are a total of 29 stages in the Mesozoic.

Its an armored dinosaur from the ankylosaur group of dinosaurs.