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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:

1. Population B competed more successfully for food than population A
2. Population A produced more offspring than population B
3. Population A consumed the members of population B
4. Both plant populations in this habitat decreased

Correct answer: Population B competed more successfully for food than population A

Solution

The graph’s opposite trends suggest interspecific competition: one herbivore population gained an advantage in obtaining food, so it increased while the other decreased. That matches population B competing more successfully for food than population A.

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