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

1. Symbiosis

2. Commensalism

3. Amensalism

4. Ectoparasitism

Subtopic:  Population Interactions: Commensalism, Protocooperation & Mutualism |
AIPMT - 2013
Please attempt this question first.
Hints