What was the real reason for the extinction of dinosaurs?

After the extinction of the dinosaurs, the earth has a different climate environment, which makes more and more species on the earth! And not less and less! Because the climate has become more and more diverse, and the more diverse the organisms have become, in fact, it cannot be called a mass extinction, but a great evolution and elimination of organisms.

Because no one wanted dinosaurs, they couldn't reproduce, and then they went extinct.

Dinosaurs eat too much, fart too much, and the ozone is thick, and when the earth is cold, they die.

I accidentally hit a huge space meteorite when I traveled through time and space, this meteorite was hit by me and flew to the earth, the hit meteorite entered the atmosphere, rubbed out flames, fell to the ground, and the dust splashed on the ground covered the whole earth, so that the earth entered a long ice age, and the dinosaurs died of starvation because of the lack of food in the ice age... Only a few small animals survived (these small animals are said to be our ancestors, and we evolved from them. That's why the dinosaurs went extinct.

Except for the part where I traveled through time and crashed into a meteorite, which is fake, everything else is true, I hope it can help you o )

Most scientists speculateDinosaur extinction events were caused by one or more causes, for example, impact events caused by asteroids or comets, or prolonged volcanic eruptions. The eruption of craters such as Chicxulub Crater and the Deccan Dark Rocks, and the close chronology of the Cretaceous-Paleogene boundary between Douhu and Douhu are thought to be the main cause of this extinction event.

Impact events or volcanic eruptions can affect ecosystems around the world by sending large amounts of air dust into the atmosphere, blocking sunlight and reducing photosynthesis by plants. But a few scientists believe that the extinction event occurred slowly, and that the cause of the extinction was gradually changing sea level and climate.

The growth and reproduction of dinosaurs

Reptiles lay eggs, and it was previously assumed that dinosaurs did the same. However, it was not until the 20s of the 20th century, when an American expedition to Mongolia to search for dinosaur fossils, that the first evidence was obtained.

Scientists have found not only the bones of dinosaurs, but also the nests and eggs they left behind. These dinosaurs were all small ceratosaurs, Protoceratosaurus. When alive, it was the size of a modern-day sheep.

Its eggs are cob-ovate, about 75 cm wide and 15 cm long, with up to 30 eggs, arranged in a spiral shape in the nest with the tip of the egg pointing inward.

The nest is located in a depression in the sand, as Protoceratosaurus lived in a sandy place. Many female dragons seem to lay eggs in the same set. By chance, in one of the nests, an egg-eating dinosaur was found, the fossilized skeleton of an egg-stealing dinosaur.

It seems that the animal was crushed to death by a sandstorm when it attacked the nest. Since then, eggs of many other species of dinosaurs have been discovered.

Dinosaur eggs are amniotic eggs, and eggs laid by other reptiles, chickens and ducks are also amniotic eggs. The outer bread of the amniotic egg has a calcareous shell that is both strong and resistant to drying, and there are many small pores on the shell that serve as "windows" for the embryonic to breathe air during embryonic development. Dinosaur eggshells are 2 mm thick and 7 mm thick, making them the thickest eggshells in the world.