Keystone species in an ecosystem are those

Options :
  1. present in maximum number
  2. that are most frequent
  3. attaining a large biomass
  4. contributing to ecosystem properties
Answer and Explanation :-

Answer: Option 4

Explanation:

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I wanted to become the seeker, the aroused and passionate explorer, and it was better to go at it knowing nothing at all, always choosing the unmarked bottle, always choosing your own unproven method, armed with nothing but faith and a belief in astonishment.
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