What defines an invasive species?

An invasive species is defined as a non-native species that can cause ecological harm when introduced to a new environment. These species often outcompete native flora and fauna for resources such as light, nutrients, and space, leading to significant disruptions in local ecosystems. They can impair ecosystem functions and services, negatively affecting biodiversity and the overall health of habitats.

The definition hinges on the aspect of being non-native and the potential for ecological harm, which is why this choice is the most accurate. Native species typically have established relationships within their ecosystems and do not pose the same risks. The other options reference characteristics that do not relate directly to the invasive nature or ecological implications of a species, focusing on scenarios that either do not involve invasive dynamics or only reflect positive aspects of biodiversity without acknowledging the potential harm or disruption caused by invasive species. Thus, understanding the definition of invasive species is vital for effective ecosystem management and conservation efforts.