If '+' sign is assigned to beneficial interaction, '–' sign to detrimental and '0' sign to neutral interaction, then the population interaction represented by '+' '–' refers to:

1. mutualism 2. amensalism
3. commensalism 4. parasitism
Subtopic:  Population Interactions: Parasitism |
 91%
Level 1: 80%+
NEET - 2016
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