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Which one is true?

1. Commensalism when none of the interacting populations affect each other
2. Symbiosis when the interaction is useful to both the populations
3. Symbiosis when neither populations affects each other
4. Commensalism when the interaction is useful to both the populations

Correct answer: Symbiosis when the interaction is useful to both the populations

Solution

The correct choice is the one describing a relationship that benefits both populations; that is the usual meaning of symbiosis in this context. The other options confuse symbiosis with commensalism or with no-effect interactions.

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