Cretaceous Mass Extinction

What caused the extinction?
o If multiple theories, briefly describe some of the most popular and indicate if there is scientific consensus.
o Describe the extinction (i.e.-the chain of events/factors that led to mass extinction)
o What is the evidence for the cause of the extinction?
What went extinct?
o What types of species?
o Were some species affected more than others? Why?
How did the earth recover?
How did it set the stage for the biodiversity we see today?
Can it happen again