Most ecosystems

Options :
  1. are sharply divided from other ecosystems
  2. consist of two or more landscapes
  3. grade into other ecosystems in regions called ecotones
  4. are clustered with other ecosystems to form communities
Answer and Explanation :-

Answer: Option 3

Explanation:

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The third component of the Law of Dharma is service to humanity--to serve your fellow human beings and to ask yourself the questions,"How can I help? How can I help all those that I come into contact with?" When you combine the ability to express your unique talent with service to humanity, then you make full use of the Law of Dharma.
-Deepak Chopra