Recently, a team of researchers from the University of Bristol conducted an analysis of ancient fish fossils to explore the evolution of the shoulder joint. The team discovered evidence that the shoulder joint evolved more than 400 million years ago and has remained relatively unchanged since then. This finding provides insight into the evolution of vertebrates and the emergence of land-dwelling animals. The researchers believe that the shoulder joint has been the key to the success of land-dwelling animals, as it allows for greater mobility and stability.

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source: Phys.org