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When did the first fish live on Earth – and how do scientists figure out the timing?

  • Written by Isaac Skromne, Assistant Professor of Biology, University of Richmond
When did the first fish live on Earth – and how do scientists figure out the timing?Reconstruction of _Haikouichthys ercaicunensis_ based on fossil evidence.Talifero/Wikimedia Commons, CC BY-SAWhen did the first fish live on Earth – and how do scientists figure out the timing?

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How do you figure out how long ago fish were created? Hundreds of millions of years...

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