If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because .
A)the impact caused massive earthquakes worldwide
B)radiation from iridium in the asteroid caused the dinosaurs to die of cancer
C)of injuries suffered from direct hits of pieces of the asteroid or comet
D)of global climate effects initiated by dust and smoke that entered the atmosphere after the impact

Question

Quizplus · Accepted Answer

The impact of the asteroid or comet caused a massive amount of dust and smoke to enter the atmosphere, blocking out the sun and causing global temperatures to drop dramatically. This led to a mass extinction event, with many species unable to adapt to the new climate conditions.

If the Hypothesis Tracing the Extinction of the Dinosaurs to an Impact