Question: Some scientists believe that the mass extinction of dinosaurs was caused by the impact of a large meteorite on Earth. This impact would have caused a darkening of the sky due to dust blown into the upper atmosphere. This darkening would have reduced the sizes of some ecosystems because of

  Options: 
 A. longer seasons.
 B. accelerated erosion.
 C. reduced photosynthesis.
 D. increased number of hurricanes.
Answer: C