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Flea beetles alone are unlikely to eliminate all of the leafy spurges in a region. Instead, the number of leafy spurge plants and the number of flea beetles in a particular community may stabilize. At this point, the leafy spurge and flea beetle populations: 

(a) have exhibited exponential growth followed by a crash 

(b) have experienced constant growth 

(c) are still experiencing exponential growth 

(d) are experiencing environmental resistance

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Best answer

Correct option: (d) are experiencing environmental resistance

Explanation:

The flea beetles have proved to be an effective means of controlling leafy spurge. The flea beetles typically take 3-5 years to establish and impact leafy spurge infestations. 

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