(Found) the book follows the evolution of a race on other world. Might have cover art with the aliens I keep picturing avatar creatures but not blue

NotAfanatic

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May 2, 2019
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read in late 80's maybe 90s. Thought it was Asimov but could not find a title that rang familiar.
They go from like "cavemen" to a technologically advanced race. I mostly remember they discovered fire by one of them falling into a pit of black stuff.
 
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