To solve this problem, we need to match the interactions in List I with their corresponding effects on the organisms in List II. Let's analyze each interaction:$\newline \bullet$A. Mutualism:$\newline$ - In mutualism, both organisms involved benefit from the interaction.$\newline$ - This matches with IV. +(A), +(B).$\newline \bullet$B. Commensalism:$\newline$ - In commensalism, one organism benefits while the other is neither helped nor harmed.$\newline$