What are invasive species?

Invasive species are defined as non-native organisms that spread and cause harm to local ecosystems. These species can disrupt the ecological balance by competing with native species for resources, predating on them, or introducing diseases. Their introduction, often due to human activities such as trade, travel, and agriculture, can lead to significant ecological changes and economic impacts.

By overcoming native species through competition for food, space, or other resources, invasive species can lead to declines in native populations, altering habitat structures and the interactions within communities. Their presence can negatively affect biodiversity, as they often thrive in new environments where they have few natural predators or controls.

In contrast, native organisms that thrive in their environment, such as the first option, do not fall under the invasive category because they have evolved to exist in harmony with their ecosystem. Enhancing biodiversity, referenced in another option, relates to healthy ecosystems where native species co-exist and support one another. Lastly, endangered species that require protection do not fit the invasive definition, as they are typically native organisms struggling to survive due to various threats. Thus, identifying invasive species is crucial for managing and protecting biodiversity.