Question 9 3 pts Now let's look that the graph for the Ornithischia group. How did this mid- Cretaceous event impact them? O They took a major hit in diversity which started a slow decline until their total extinction at the end of the Cretaceous. O They were barely impacted by this mid-Cretaceous event. Can't tell by this graph Diversity declined sharply, but then rebounded dramatically with far more diversity than before.