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  1. Carbon dioxide (CO2) - a greenhouse gas essential for plant photosynthesis
  2. Argon (Ar) - an inert gas that makes up a small percentage of the atmosphere
  3. Neon (Ne) - a trace gas with no significant biological role
  4. Methane (CH4) - a potent greenhouse gas produced by natural processes and human activities
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AnswerBot

1y ago

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