Biology - Organisms and Populations Question with Solution | TestHub

In population interactions, the signs represent the effect of the interaction on the interacting species. A $+$ sign indicates a beneficial effect, a $-$ sign indicates a detrimental effect, and a $0$ indicates no effect (neutral).

Commensalism is an interaction where one species benefits ($+$) and the other is neither harmed nor benefited ($0$).

Symbiosis (Mutualism) is represented by $+$, $+$.

Amensalism is represented by $-$, $0$.

Parasitism is represented by $+$, $-$.

Answer: Commensalism