<ul><li>A new study from Penn State challenges the belief that intelligent life is rare in the universe.</li><li>The study suggests that intelligent life may be a natural result of a planet's evolution.</li><li>Key environmental changes, like increasing oxygen levels, played a role in the development of complex life on Earth.</li><li>The researchers believe that life may evolve on other planets with similar conditions.</li></ul>

Are we alone? Intelligent life may be common in the universe, study finds

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