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A sedentary sea anemone gets attached to...

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

A

commensalism

B

Amensalism

C

Ectoparasitism

D

symbiosis

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The correct Answer is:
A
Some authors have called this association Mutualism (Symbiosis), some called it Protocooperation while some others say it is Commensalism . This (a ) and (d) are both correct.
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