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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I went to the woods because I wished to live deliberately, to front only the essential facts of life, and see if I could not learn what it had to teach, and not, when I came to die, discover that I had not lived
-Henry David Thoreau Walden