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The following graph depicts changes in two populations $(A$ and $B)$ of herbivores in a grassy field. $A$ possible reason for these changes is that

population $A$ produced more offspring than population $B$
population $A$ consumed the members of population $B$
both plant populations in this habitat decreased
population $B$ competed more successfully for food than population $A$
Solution
(d) : Both the populations are herbivorous, thus they cannot affect each other. If the food sources for these populations $A$ and $B$ have decreased, then both the populations $A$ and $B$ would have declined. If population $A$ have produced more offspring then the graph $A$ should have increased. Based on the graph, population $B$ is more successful in competing with population $A$, that is why number of organisms in population $B$ increased while that in population $A$ decreased, as they get access to limited resources.