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A sedentary sea anemone gets attached to the shell lining of hermit crab. The association is:

1. Symbiosis
2. Commensalism
3. Amensalism
4. Ectoparasitism

Correct answer: Commensalism

Solution

This is commensalism because the sea anemone benefits by getting a place to live and better access to food, while the hermit crab is not significantly helped or harmed. The relationship is not parasitic because the crab is not being damaged.

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