If Dinosaurs ever lived, how did they become extinct?

Answer 1

The sudden mass extinction of the non-avian dinosaurs, which occurred around 65 million years ago, is one of the most intriguing mysteries in paleontology. Many other groups of animals also became extinct at this time, including ammonites (nautilus-like mollusks), mosasaurs, plesiosaurs, pterosaurs, herbivorous turtles and crocodiles, most birds, and many groups of mammals.[32] The nature of the event that caused this mass extinction has been extensively studied since the 1970s. At present, several related theories are broadly supported by paleontologists.

Asteroid collision
Multiple collisions—the Oort cloud
Environment changes

Answer 2

We'll never know for certain. The bolide impact theory has been around for 25 years, so you can find all sorts of info (look up K-T boundary, Iridium anomaly). While the evidence for the impact is good, a causal link to the extinction isn't so strong. Dinosaurs, ammonites, and many other marine invetebrates were already on a decline before the impact (may have) occurred. What's true is an ecological collapse of global proportions occurred, so no single answer is likely reasonable.

There are other mass extinction events in the geological record. One occurred during the Upper Devonian. The largest, by far, was at the end of the Permian Period (extinction of trilobites, etc.). There is no (good) evidence for extraterrestrial factors in these events, so mass extinction appears to be a natural (if thankfully very infrequent) phenomenon.

Answer 3

They aren't totally extinct because there are still dinosaurs living in parts of the World that have not been discovered.

Answer 4

A huge meteorite slammed into what is now the Gulf of Mexico, thus releasing so much dust into the atmosphere that it blocked off the sun killing all plant life and hence the dinosaurs, also there were huge tidal waves and enormous earthquakes.

Good News : It happens once in 250 million years and the next one is overdue.

Answer 5

This is sort of like asking "When did the western half of the Roman Empire fall?" Well, some Historians will say that it didn't fall. It just became the dark ages. Well, dinosaurs just became lizards. The DNA of the Jackson lizard is identical to the DNA of the triceratops. Hm...

Answer 6

Because the impact of an asteroid in chicxulub,Mexico's Yucatan Penninsula.The Chicxulub impact is widely believed to have triggered a mass dinosaur die-off.

Answer 7

Dinosaurs became extinct out of changes on the earth for various reasons. Lack of adaptibility. Lack of their foods. Lack of them being able to adapt to new environments (ie heating of the earth and ice melting). Lack of being able to repopulate (ie no reproduction). There is also a portion I believe which evolved into something else (ie birds) which Is one of the newer theories based upon feather fossils recently found.

Answer 8

I was watching the history channel last night and saw that; way back when dinosaurs roamed the earth George Dubya's great, great, great ........ grandfather was in office and someone told him that the dinosaurs had nuclear bombs. So the original Georgie had nothing else to do but blow them all away. I saw it on tv, it must be true.

Answer 9

Some say many different things but I have to believe it was only a few different things combined like an astroid then the ice age you see the astroid destroyed the air and created a lower temp. making it only livable for some small creatures wich have changed over millions of years.

Answer 10

The earth was hit at mexico's yucatan peninsula 65 million years ago that formed a cloud of dust that surrounded the entire earth that blocked sunlight and without sunlight, producers(plants) would die and without plants, nothing on earth can live.