What can we learn from such data?
- First, the data suggest than on average, millions of years may pass before a newly formed species will itself give rise to another new species. This result has implications for how long it takes Earth's life to recover from mass extinction events.
Second, the extreme variability in the time it takes new species to form indicates that organisms do not have a "__" ticking inside them, causing them to produce new species at regular time intervals. Instead, __ begins only after __ between populations is interrupted, perhaps by an unpredictable event such as a storn that transports a few individuals to an isolated area. Furthermore, once __ has been interrupted, the populations must diverge genetically to such an extent that they become reproductively isolated- all before another event causes __ to resume, reversing the __ process.
- speciation clock
- gene flow x3