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flag Fossil reveals early reptiles used rib muscles to breathe efficiently.

flag A 289-million-year-old mummified reptile fossil from Oklahoma provides the earliest direct evidence of rib-powered breathing in vertebrates. flag The discovery reveals a complex chest assembly in a small lizard-like creature, showing that early amniotes used rib muscles to ventilate their lungs. flag This adaptation enabled more efficient respiration and likely contributed to the evolutionary success of reptiles, birds, and mammals.

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