Jawless fish and ocean reefs were devastated by which extinction?

late devonian

ordovician-silurian

permian-triassic

end triassic

cretaceous-tertiary

The Late Devonian.

If you go back and reach the text, you may find the passage, "Which species did we lose during this extinction (Late Devonian)? About 20% of all animal families and 70-80% of all animal species were lost. Major victims included the following:

- Jawless fish"

to treat tumors in the body

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