The shift in the peak of caterpillar season is most likely due to

Flycatcher birds that migrate from Africa to Europe feed their nestlings a diet that is almost exclusively moth caterpillars. The graph in Figure 43.3 shows the mean (peak) dates of bird arrival, bird hatching, and 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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