Extinction for all species is inevitable. After all, if nothing else happens one of the following will:
Either the earth will eventually cool to a point where the convection currents in the magma are too slow to maintain the earth's emf resulting in the solar winds stripping away the atmosphere; or
The sun will become a giant and absorb the earth anyway.
I can't remember the exact figure but I think it was 140million years was the average any one species existed before disappearing. They are generally replaced by new species.
As the oft misquoted Darwin said "It is not the strongest who will survive, nor the most intelligent. But those most responsive to change"
In other words, if you're a Tuatara that'll eat just about anything, your species will probably live for 200million years or so. But if you're a giant panda who only eats the bamboo shoots of certain types of bamboo, well then I wouldn't be doing any long term planning.



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