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...history of the species, populations in distant regions will have accumulated genetic differences. This leads to genetic diversity. On the species scale, genetic diversity can be seen as different genetic clades, or different branches on the lion-tree. These patterns of genetic diversity are disrupted when two populations from different regions are mixed. The seven lions...

...history of the surface and can be used to determine the age of different regions of the Moon. Older parts of the lunar surface have relatively large numbers of craters, having been exposed for longer. In contrast, the smoother seas with fewer and smaller craters represent more recent outflows, now solidified, that took place after the end of the main phase of bombardment...