Question

In the population interaction called commensalism,

Answer 1

Commensalism is (+, 0) interaction, where one species is benefitted and other one is neither harmed non-benefitted. For example, pilot fish and shark.

Mutualism is an association between individuals of two species, both of which are benefited but can not live separately under neutral conditions. For example, termites and flagellates.

Parasitism is an association of two organisms of different sizes and species in which the smaller one is benefited and the large one is harmed.

Competition is the interaction between two species where both are harmed in some or the other way