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


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The POSITIVE THINKER sees the INVISIBLE, feels the INTANGIBLE, and achieves the IMPOSSIBLE. Winston Churchill, My Early Life,