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Eerie Lampreys Hint at the Origins of Our ‘Fight-or-Flight’ Response and Sympathetic Nervous System. The jawless, parasitic fish largely haven’t changed over the last 340 million years, but they might be better sources for studying our own evolution than thought, a recent study suggests.

The jawless, parasitic fish largely haven't changed over the last 340 million years, but they might be better sources for studying our own evolution than thought, a recent study suggests

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