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| स्तंभ $-I$ | स्तंभ $-II$ |
|---|---|
| $(a)$ परभक्षण | $(i) \ (-, 0)$ |
| $(b)$ सहभोजिता | $(ii) \ (+, -)$ |
| $(c)$ सहोपकारिता | $(iii) \ (+, 0)$ |
| $(d)$ अंतरजातीय परजीविता (अमेंसलिज्म) | $(iv) \ (+, +)$ |
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