how did the dinosaurs become extint?

Question

How did they disappear from the face of earth?

Answer 1

Smoking!

Answer 2

The earth was hit by a large meteorite 65 million years ago, off the coast of Yucatan, Mexico. It caused a mass extinction event, which wiped out not only the dinosaurs, but many other then-extant species as well.

http://en.wikipedia.org/wiki/Cretaceous-Tertiary_extinction_event

Answer 3

A última teoria foi descrita através dos dinaussaros serem extintos por um cometa, mas isto não foi comprovado e até hoje os cientistas tentam descobrir este enigma da ciência, que algum dia deverá ser revelado.


The last theory was described through dinaussaros dos to be extinct for a comet, but this was not proven and until today the scientists science tries to discover this enigma da, that some day will have to be disclosed.

Answer 4

The most plausible reason was that of a meteor. But that cannot be counted as the only reason as to why they got extinct. There were huge amounts of epidemics among the dinosaur and this too was a makor cause in the extinction of the dinosaurs.

Answer 5

A meteor hit the earth causing a winter effect. all land animals starved to death.

Answer 6

They were harvested for protein. Imagine this: the world full of edibles creatures. How do you catch them...... write a book saying they are going into the sky, in chariots of fire...oh, we're next!

Answer 7

Extinction is the process in which groups of organisms (species) die out. If the birth rate is less than the death rate over time, extinction results. Extinction is a natural result of evolution. Species go extinct when they are unable to adapt to changes in the environment or compete effectively with other organisms. Well over 99 per cent of the species that have ever lived have gone extinct.
Most extinctions (perhaps up to 95 per cent of all extinctions) occur as background extinctions, occurring throughout time. These extinctions are not caused by major catastrophes or horrendous climactic changes, but by small changes in climate or habitat, depleted resources, competition, and other changes that require adaptation and flexibility.

Most dinosaur species perished in background extinctions that occurred throughout the Mesozoic Era. For example, Maiasaura, Styracosaurus, Protoceratops, Dilophosaurus, Cetiosaurus, Iguanodon, Allosaurus, Ouranosaurus, Deinocheirus, and Edmontosaurus were probably decimated in background extinctions. The flowering plants (angiosperms) appeared during the Cretaceous period, displacing most conifers and many other plants. This had major effects on dinosaurs. Some herbivorous dinosaurs, like Edmontosaurus, ate only conifers. As flowering plants came to dominate the landscape, Edmontosaurus died out, unable to find enough conifers to sustain itself.


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MASS EXTINCTIONS

A mass extinction is a relatively sudden, global decrease in the diversity of life forms. Mass extinctions have occurred periodically throughout the existence of life on Earth. To be a mass extinction, the following must occur:
Extinctions occur all over the world.
A large number of species go extinct.
Many types of species go extinct.
The extinctions are clustered in a short amount of geological time (a few million years is very short in terms of geological time).
The five largest mass extinctions in Earth's history occurred during:
The late Ordovician period (about 438 million years ago) - 100 families extinct - more than half of the bryozoan and brachiopod species extinct.
The late Devonian (about 360 mya) - 30% of animal families extinct.
At the end of the Permian period (about 245 mya) - Trilobites go extinct. 50% of all animal families, 95% of all marine species, and many trees die out.
The late Triassic (208 mya) - 35% of all animal families die out. Most early dinosaur families went extinct, and most synapsids died out (except for the mammals).
At the Cretaceous-Tertiary (K-T) boundary (about 65 mya) - about half of all life forms died out, including the dinosaurs , pterosaurs, plesiosaurs, mosasaurs, ammonites, many families of fishes, clams, snails, sponges, sea urchins and many others.
Many minor extinctions have occurred through Earth's history.

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THE NEMESIS HYPOTHESIS

The nemesis hypothesis of Raup and Sepkoski theorizes that there is a periodicity of 26 million years to mass extinctions which is caused by collisions with comets from the Oort cloud as they are perturbed in their orbits by a dark star (a companion star to the sun). The search for the Oort cloud continues.
THE EXTINCTION OF THE DINOSAURS

Most dinosaur species perished in background extinctions that occurred throughout their Mesozoic Era. The other dinosaur species died out during the several mass extinctions that occurred in the Mesozoic: at the end of the Triassic (213 million years ago), during and at the end of the Jurassic (at 190, 160, 144 mya), and during and at the end of the Cretaceous (at 120, 82, and 65 mya).

Answer 8

EARTH PROBLEMs...
some theory say meteor shower.
others say ice age...
many reasons...nobody really knows yet

Answer 9

due to the extreme old they did not had any food to eat and also due to the natural calamities like volcanic explosion

Answer 10

I actually saw one at your mum's house last week!