Which types of organisms are most likely to survive change in an ecosystem, those that have a narrow ecological niche or those that have a broad niche?

The answer is obviously the organism with broad niche.

Explanation:

Organisms can have a broad niche or a narrow ecological niche. This can be explained as follows: If an organism has adapted itself to wide range of environmental conditions then it can survive changes in an ecosystem, hence it has a broad niche. Some organism adapt to only specific environmental conditions and cannot survive if it changes, such organisms are said to have narrow niche.

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