How Many Friends Does One Person Need? - Plot & Excerpts
Chapter 12 Farewell, Cousins Species change through the gradual failure of some lineages to reproduce, resulting in a subtle but steady drift in the species’ genetic make-up towards that of lineages that are more successful. Although in most cases these processes are quite slow, an entire species can go extinct catastrophically if none of its various lineages can reproduce fast enough to offset unusually high levels of mortality. There is always a steady trickle of such extinctions over time – there have been literally dozens within our own lineage during the course of our six-million-year evolutionary history. Sometimes, however, environmental conditions conspire to produce a rapid burst of extinctions. Farewell, cousins... Sixty-five million years ago, a massive asteroid smashed into the corner of Mexico where the Yucatan peninsula now stands. The resulting fireball, combined with millions of tons of vaporised rock thrown up into the atmosphere, brought on a nuclear winter that changed the face of the earth for ever.
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