The nature of the relationship between sea anemones and clownfish by analyzing each option:
Predation: This implies one organism preys on the other, which is not the case here.
Mutualism: Both species benefit from the relationship. Clownfish receive protection from predators by living among the sea anemone's stinging tentacles, while sea anemones benefit from the nutrients provided by the clownfish through their waste.
Parasitism: This involves one organism benefiting at the expense of the other, which does not describe their interaction.
Competition: This would involve both species vying for the same resources, which is not applicable here.
Conclusion: The relationship between sea anemones and clownfish is mutualistic, as both species benefit from each other.