Use the following graph and information to answer the question below
Flycatcher birds that migrate from Africa to Europe feed their nestlings a diet that is almost exclusively moth caterpillars. The graph below shows the mean dates of arrival, bird hatching, and peak caterpillar season for the years 1980 and 2000.
The shift in the peak of caterpillar season is most likely due to _____.
A) pesticide use
B) earlier migration returns of flycatchers
C) an innate change in the biological clock of the caterpillars
D) global warming
E) acid precipitation in Europe
Answer: D
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