Why Do Dinosaurs Die Out

The mass extinction(s) were commonly caused by extreme climate change and animals couldn't adapt quickly enough to change.

90 percent of all the species have lived, died and are extinct.

The most commonly studied mass extinction was between the Cretaceous and Paleogene periods, when the dinosaurs disappeared on Earth.

When a species dies the earth has more room to form and evolve a new species.

Scientists are still unsure of what really happened and why these mass extinctions occur, they call them “unsolved mysteries.

Although volcanic eruptions and large asteroids and comets are used as explanations to mass extinctions

Both disasters would lead to a dirty environment, having a bunch of debri in the air.

Darkening skies can lasts months

That gives scientists an advantage of what happened and why all the dinosaurs died.

The extraterrestrial impact and a volcanic eruption caused the dinosaurs and half the animals and the planet to go extinct.

Link two http://www.history.com/topics/why-did-the-dinosaurs-die-out All what scientist have are theories, there is no exacted explanation of what happened to cause the 5 major extinctions.

Although scientists’ theories make a lot of sense and can be very believable.

Paleontologists’ believed that climate and geological changed interfered with the dinosaurs’ food supply.

A comet hit earth about the same time dinosaurs started dying.

Dinosaurs walked on earth for 160 million years and then disappeared 65 million years ago.

The extinction was called the Cretaceous-Tertiary or K-T

One theory was that smaller mammals ate the dinosaur eggs and reduced the dinosaur population.

Another theory is that the dinosaurs got too big for their tiny brains and they couldn't operate anymore.

Starvation was another theory, dinosaurs need a vast amount of food possibly cut short on

Scientists say that the asteroid or comet hit mexico was the reason why the dinosaurs are extinct.

This bout of volcanism has also been dated to about 65 million years ago and would have spread the iridium around the world, along with sunlight-blocking dust and soot and greenhouse gases.

Some scientists think that both an asteroid and a volcanic eruption caused the excretion of dinosaurs.

Link four http://www.livescience.com/26933-chicxulub-cosmic-impact-dinosaurs.html The main suspect behind this catastrophe is a cosmic impact from an asteroid or comet, an idea first proposed by physicist Luis Alvarez and his son geologist Walter Alvarez.

Link five https://www.britannica.com/animal/dinosaur “The name dinosaur comes from the Greek words deinos (“terrible” or “fearfully great”) and sauros (“reptile” or “lizard”).”

In order to understand extinction, it is necessary to understand the basic fossil record of