If'+' sign is assigned to beneficial interaction, '- ' sign to detrimental and 'O' sign to neutral interaction, then the population interaction represented by'+''-' refers to

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mutualism

amensalism

commensalism

parasitism

answer is D.

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Detailed Solution

In both parasitism and predation only one species benefits '+' (parasite and predator, respectively) and the interaction is detrimental (harmful) to the other species (host and prey, respectively).

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