What do scientists believe caused dinosaurs to become extinct?

What do scientists believe caused dinosaurs to become extinct?

A big meteorite crashed into Earth, changing the climatic conditions so dramatically that dinosaurs could not survive. Ash and gas spewing from volcanoes suffocated many of the dinosaurs. Diseases wiped out entire populations of dinosaurs. Food chain imbalances lead to the starvation of the dinosaurs.

What caused the dinosaurs to go extinct 65 million years ago quizlet?

65 million years ago many volcanoes around the world flooded earth’s atmosphere with CO2 trapping heat from the sun and causing global warming. It is believed that the warming of earth caused reptiles to produce unhealthy sperm and eggs, resulting in the extinction of dinosaurs.

Did all dinosaurs go extinct 65 million years ago?

Dinosaurs went extinct about 65 million years ago (at the end of the Cretaceous Period), after living on Earth for about 165 million years. The dinosaurs’ long period of dominance certainly makes them unqualified successes in the history of life on Earth.

What do scientists say happened 65 million years ago?

Cretaceous-tertiary Extinction: 65 Million Years Ago Scientists refer to the major extinction that wiped out nonavian dinosaurs as the K-T extinction, because it happened at the end of the Cretaceous period and the beginning of the Tertiary period.

What event was responsible for the extinction of the dinosaurs quizlet?

The Alvarez team suggested a stunning hypothesis: the extinction of the dinosaurs was caused by the impact of an asteroid or comet. The death of the dinosaurs was only a small part of the biological devastation that seems to have occurred 65 million years ago.

What era did the dinosaurs go extinct quizlet?

The dinosaurs and the mammals appeared during the Triassic period, roughly 225 million years ago. The dinosaurs went extinct 65 million years ago. It lasted about 180 million years, and is divided into three periods, the Triassic, the Jurassic, and the Cretaceous.

Why did dinosaurs get extinct?

Evidence suggests an asteroid impact was the main culprit. Volcanic eruptions that caused large-scale climate change may also have been involved, together with more gradual changes to Earth’s climate that happened over millions of years.