Final answer:
Predator-prey interactions are -/+ relationships, meaning that one species benefits (the predator, through gaining nourishment) while the other is harmed (the prey, which is killed). Such relationships are complex and influenced by various ecological factors.
Step-by-step explanation:
In terms of the species' interaction, predation can be defined as a -/+ relationship. This term implies that one species, the prey, is harmed (+) by the interaction as it is killed and consumed, while the other, the predator, benefits (-) by gaining nourishment. This concept can be demonstrated by the relationship between the lynx (predator) and the snowshoe hare (prey). The lynx gain nourishment by consuming the hare, hence benefiting from the interaction, while the hare is killed and therefore harmed.
While this is a simple example, in the real world predator-prey relationships involve a complex interplay of population sizes, availability of resources, and other ecological factors.
Learn more about Predator-Prey Relationships