commensalism when none of the interacting populations affect each other
symbiosis when the interaction is useful to both the populations
symbiosis when neither populations affects each other
commensalism when the interaction is useful to both the populations.
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The Correct Option isB
Solution and Explanation
When the interactions is useful to both the populations it is called symbiosis. Symbiosis means living together. It is beneficial co-action between two or more different species in which one or both species are benefitted and neither species is harmed.