Final answer:
Invasive species are non-native organisms disrupting ecosystems, causing ecological and economic harm.
Explanation:
Invasive species are non-native organisms that, when introduced to an area out of its native range, disrupt the community they invade. These species are often introduced by humans into new ecosystems, leading to ecological and economic damage. For example, species like the zebra mussel and emerald ash borer have significantly altered ecosystems by outcompeting native species and causing harm.
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