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GS Geography Physical Geography of World
Q.

Which is the most stable eco-system?
Explanation:

ANS. (B) 
Ecosystem can be natural or man-made, large or small, permanent or temporary, complete or incomplete. Natural ecosystem. It is an ecosystem developed under natural conditions without any appreciable human interference. Natural ecosystem can be terrestrial (e.g., forest, desert, grassland) or aquatic (e.g., fresh water, lake, pond, river, sea). Oceans constitute the most stable ecosystem.

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