Which statement best describes an invasive species?

• A. Species that are beneficial to the ecosystem
• B. Non-native species that spread rapidly and cause harm
• C. Species that are endangered
• D. Native species that are declining in number

Answer: (B)

An invasive species is best described as a non-native species that spreads rapidly and causes harm to the environment, economy, or human health. These species can outcompete, displace, or prey on native species, leading to significant ecological changes and negatively impacting biodiversity. Invasive species often thrive in new environments due to a lack of natural predators or diseases that would typically keep their populations in check.

This definition underscores the critical distinction between invasive species and other types of species. Beneficial species contribute positively to their ecosystems, endangered species are at risk of extinction but are not necessarily harmful, and declining native species may be losing ground due to various factors, including habitat loss, but they do not fit the profile of invasive species. This highlights the specific threat posed by invasive species and emphasizes the need for management and control efforts to protect native biodiversity.