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Question:

The above 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.

Population B competed more successfully for food than population A.

Both plant populations in this habitat decreased.

Solution:

The two populations A and B are herbivores which are competing for the same food. Population A decreased as it was not well adapted as population B. Population B was able to strive for the available food. So, the correct answer is option D.