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(B) The graph illustrates a classic case of competitive exclusion. As population $B$ increases,population $A$ decreases over time. This suggests that

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population $B$ competed more successfully for food than population $A$ did.

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(B) The graph illustrates a classic case of competitive exclusion. As population $B$ increases,population $A$ decreases over time. This suggests that both populations are competing for the same limited resource (e.g.,grass). Since population $B$ is better adapted or more efficient at utilizing this resource,it outcompetes population $A$,leading to a decline in the number of individuals in population $A$.

Column-$I$	Column-$II$
$(a)$ Parasitism	$(i)$ $++$
$(b)$ Commensalism	$(ii)$ $+-$
$(c)$ Amensalism	$(iii)$ $0+$
$(d)$ Mutualism	$(iv)$ $0-$

The graph below shows the changes in two populations of herbivores in a grassy field. $A$ possible reason for these changes is that

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$(d)$ Mutualism $(iv)$ $0-$

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