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The gradual change of a species by adaptation over many generations for purposes ensuring it's survival.

4 votes

Old sci-fi story in which fleeing aliens merge with spiders on Earth in the prehistoric era

Aside from the Clarke story, it may have merged with "The Green Drift" by John Lymington. I read it as "The Green Spiders Came Tomorrow", and it has spiders, time paradox, and if I'm not mistaken the …
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