... Cataclysmic events happen every now and then and causes extinctions and hardship on surviving organisms
Indeed, it appears that periodic cataclysmic events are required in order to keep evolution going.
We've seen several eras in Earth's history where life appears to "stagnate" at some level, proceeding with little-or-no change for long periods. The last of which was the "age of dinosaurs", which lasted 170 million years or so, depending on how you define the starting point. It ended with the Chicxulub impact.
We also see numerous examples of species which are largely unevolved; for example, ants have been arou
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/RZAvsjtDBE4/story01.htm
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