Multiple choice general knowledge science & technology It is now believed that Dinosaurs became extinct because of: Viral disease Hunting by early humans A world wide period of climatic cooling A meteorite impact Reveal answer Fill a bubble to check yourself D Correct answer Explanation The leading scientific theory for dinosaur extinction is that a massive meteorite impact 66 million years ago caused climate disruption that wiped them out. This created the Chicxulub crater and led to mass extinction.