| $A. +/+$ | $I. \text{Predation}$ |
| $B. -/-$ | $II. \text{Ammensalism}$ |
| $C. +/-$ | $III. \text{Competition}$ |
| $D. -/0$ | $IV. \text{Mutualism}$ |
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| $(I)$ Interaction | $(II)$ Effect |
|---|---|
| $(a) (+, -)$ | $(P)$ Amensalism |
| $(b) (-, -)$ | $(Q)$ Commensalism |
| $(c) (-, 0)$ | $(R)$ Predation |
| $(d) (+, 0)$ | $(S)$ Competition |
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