Why do many non-native species, such as a prickly pear cactus brought to Australia from South America, rapidly become abundant when first introduced?

Question

Quizplus · Accepted Answer

Non-native species often lack the natural predators and parasites that would normally control their population in their native ecosystem, allowing them to rapidly become abundant in their new site. In this case, the prickly pear cactus may not have natural predators in Australia that would keep its population in check.

Why Do Many Non-Native Species, Such as a Prickly Pear