Which one is self perpetuating

Options :
  1. physical control of pests
  2. biological control of pests
  3. both the above
  4. none of these
Answer and Explanation :-

Answer: Option 2

Explanation:

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We're all water from different rivers,That's why it's so easy to meet,We're all water in this vast, vast ocean,Someday we'll evaporate together.
-Yoko Ono