(Figure 15.13) The figure shows population fluctuations in forest tent caterpillars over a 60-year period. The caterpillars were susceptible to a viral infection throughout this time. What causes the 10- to 15-year population fluctuation in the caterpillars?

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(Figure 15.13) The figure shows population fluctuations in forest tent caterpillars over a 60-year period. The caterpillars were susceptible to a viral infection throughout this time. What causes the 10- to 15-year population fluctuation in the caterpillars?