Discussion
The equilibrium model of an ecosystem states that :
Answer: D
The equilibrium model says an ecosystem always tends towards stability.
The classical equilibrium (balance of nature) view holds that ecosystems are self-regulating. After a disturbance, negative feedbacks and succession return the system to a stable climax state, as in Clements' climax concept.
The first three options describe the opposite, non-equilibrium view, in which disturbance and chance keep ecosystems from settling and they need not return to their original state. An ecosystem perishing under change is not what any equilibrium model predicts.
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