Which of the following does not describe commensalism ?

Options :
  1. Epiphyte growing on a tree
  2. Bird nesting on a tree
  3. Small fish surviving on the excreta of the bigger fish
  4. E.Coli residing in the blood stream of human
Answer and Explanation :-

Answer: Option 2


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Alone we can do so little together we can do so much
-Helen Keller