In 1772 Joseph Priestly demonstrated that

Options :
  1. plants and animals resorts air for each other
  2. plants have the capacity to purify foul air
  3. plants get killed in the air produced by animals
  4. animals purify the air during day time


Answer and Explanation :-

Answer: Option 2

Explanation:

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Perhaps I shouldn't like it so much, but I've always been one for finding beauty in the ugliest stories.
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