The species considered invasive in the list provided is kudzu vines. Invasive species are non-native organisms that, when introduced to a new environment, have the potential to cause harm to the ecosystem, economy, or human health. Kudzu vines are known for their aggressive growth and ability to smother other vegetation, leading to the disruption of local ecosystems.
- Polar bears are not considered invasive species as they are native to the Arctic region.
- Earthworms, although non-native in some areas, are generally not classified as invasive species as they play a beneficial role in soil health.
Therefore, out of the options given, kudzu vines are the species that fall under the category of invasive species due to their harmful impact on the environment.
