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Which is an example of the bottleneck effect? Green beetles move to a new location and build a new colony there. Green beetles survive as birds don't see them, whereas brown beetles get detected. Insecticide spraying eliminates all but a few of the beetles on an island.

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The bottleneck effect is when the population of a species is reduced due to an environmental disaster or human activities. An example of the bottleneck effect is "Insecticide spraying eliminates all but a few of the beetles on an island". For the species to survive, the green beetle will either have to move to a new location and build a new colony or they will have to develop a resistance to the insecticide and then start to rebuild the existing colony