A comet striking the earth may have caused mass extinction, this would have decreased sunlight, which would have effected what plant process reducing food?
glycolysis
fertilization
decomposition
photosynthesis
At the end of the Cretaceous Period, or 65 million years ago, all dinosaurs (except those which led to birds) went extinct. Some scientists believe a possible cause is a collision between the Earth and a comet or asteroid. The collision could have caused tidal waves, changed the climate, and reduced sunlight by 10-20%. A decrease in photosynthesis would have resulted in less plant food, leading to the extinction of the dinosaurs.