Trophic cascade toh woh hain jaise ek pehle aadmi gira, phir sab gira — jaise bachpan mein hamare gaon mein cheel (vulture) bahut the, aur mara hua janwar saaf ho jaata tha. Ab cheel gayab, toh kutte bharak gaye, aur bimariya failti hai. Sea otter-wale gyan se hum nahi jaante, par yeh keystone jaati asli mein hoti hai. Aaj dekha hai, jahan cheel nahi, wahan murde bich sadakon par padhe rehte hain, beemar banate hain.
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