There are many theories as to why, but most scientists agree that a huge meteor crashed in the Yucatan Peninsula causing global ash clouds, tidal waves, and many other problems for dinosaurs and other extinct animals.
no one knows 4 sure
buffalo
They did not disappear but instead they died and it might be because event was caused by climate and geological changes that interrupted the dinosaurs' food supply.
A mass impact threw dust into the atmosphere; this "shaded" the Earth from the Sun's warming rays.
Avian dinosaurs survived the extinction event of the dinosaurs.
paleontology
Nobody has any idea what caused the Mayas disappearance.
No there are no dinosaurs in runescape.Maybe later in an event. But not nowThere are dragons, though.
building of the transcontinental railroad - disappearance of the frontier
The disappearance of the Roanoke Island colony in the late 16th century is still a mystery, but it is believed to have been caused by a combination of harsh weather, lack of resources, and possible conflicts with Native American tribes. The last known communication was the word "CROATOAN" carved into a post, hinting that they may have tried to move to a nearby island called Croatoan.
i believe croatoan is a disease that caused the disappearance of roanoke
The only dinosaurs to have survived the K-T extinction event are birds.
The disappearance of sound is caused by blood flowing freely. The blood flows freely because there is no constricted artery.