1)explain the difference between background extinction and mass extinction.

2)Why did the researchers use bivalves as the subject of their research?

3)Do the data that Krug and Jablonski used to analyze origination rates show mass extinctions directly or indirectly? Explain your answer.

4)In your own words, summarize the findings of Krug and Jablonski’s analyses.

5)Advanced: Do you think an adaptive radiation is more likely to occur after an event in which many lineages go extinction or after an event in which only a few lineages go extinct or would it make a difference? Explain your reasoning

https://evolution.berkeley.edu/evolibrary/article/massextinctions_01