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Which of the following kinds of organisms are best adapted to habitats that are frequently subject to unpredictable and severe environmental fluctuations?

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Organisms with very specific diets

Correct Answer: 
No

Ectothermic organisms

Correct Answer: 
No

Top predators

Correct Answer: 
No

Keystone species

Correct Answer: 
No

r-selected organisms

Correct Answer: 
Yes