Which type of interactions are predation and parasitism?
The (+) sign indicates a beneficial interaction between the two species involved. The (-) sign indicates the harmful interaction between the two organisms. Predation is the form of interaction in which the predator is benefited in the form of food (prey). In parasitism, the parasite is benefited and the host is destroyed. The host is devoid of the nutrition and may be killed by some parasites. Hence , +,- is correct.
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