Pg 6: "Considering the observed distributions of body mass in each clade of primates, the clade effect now explains the overall positive relationship between body mass and speciation rate." What exactly is meant by clade effect? How was it taken "into account" in this study to produce a negative relationship (pg 10)?
Pg 8:"It cannot be excluded that a likelihood function may be derived taking extinction into account, but this derivation still needs to be found." What are the major obstacles to incorporating extinction into a liklihood function?
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