Which data is the best representation of the background extinction rate?
1) Both portions of the data should be used to estimate the background extinction rate.
2) The background extinction rate is the average rate of species loss at all times.
3) The data representing Extinctions since 2010 should be used to estimate the background extinction rate.
4) The data representing extinctions rates using Cenozoic fossils should be used to estimate the background extinction rate.



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