Which of the following maintains a stable eco-system :

Options :
  1. Plateaus
  2. Forests
  3. Hills
  4. Glaciers
Answer and Explanation :-

Answer: Option 2

Explanation:

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Life was a swarm of accidents waiting in the treetops, descending upon any living thing that passed, ready to eat them alive. You swam in a river of chance and coincidence. You clung to the happiest accidents- the rest you let float by.
-David Wroblewski The Story of Edgar Sawtelle