Which organism is affected first when oxygen is removed from biosphere

Options :
  1. primary consumer
  2. producer
  3. secondary consumer
  4. decomposer
Answer and Explanation :-

Answer: Option 2

Explanation:

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Somewhere fate laughs in her far-off country, because now I am the human and it is Grace I will lose again and again, immer wieder, always the same, every winter, losing more of her each year, unless I find a cure.
-Maggie Stiefvater Linger