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Researchers have discovered a 380-million-year-old heart — the oldest ever found — alongside a separate fossilized stomach, intestine and liver in an ancient jawed fish, shedding new light on the evolution of our own bodies.
Researchers have discovered a 380-million-year-old heart — the oldest ever found — alongside a separate fossilized stomach, intestine and liver in an ancient jawed fish, shedding new light on the evolution of our own bodies.