The Panspermia Hypothesis and the Distribution of Life

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What is the central idea behind the Panspermia Hypothesis?

  1. Life on Earth originated from extraterrestrial sources.
  2. Life on Earth evolved independently from non-living matter.
  3. Life on Earth is the result of a combination of extraterrestrial and terrestrial factors.
  4. Life on Earth is the only life in the universe.
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