Why are invasive species considered dangerous to the environment?

• A. They only affect the physical environment and do not interact with native species.
• B. They often outcompete native species for resources, leading to declines or extinctions of native populations.
• C. They are unable to survive in new environments and therefore have no impact.
• D. They always increase biodiversity by introducing new species to an ecosystem.

Answer: (B)

Verified step by step guidance

1. Understand the concept of invasive species: Invasive species are non-native organisms introduced to an ecosystem, often by human activity, either intentionally or accidentally. They can thrive in new environments due to a lack of natural predators or competitors.
2. Analyze the impact of invasive species on native populations: Invasive species often outcompete native species for resources such as food, water, and habitat. This competition can lead to declines or extinctions of native populations.
3. Consider the ecological balance: Invasive species can disrupt the balance of ecosystems by altering food webs, nutrient cycles, and physical environments, which can have cascading effects on biodiversity.
4. Evaluate the statement about biodiversity: While invasive species introduce new organisms to an ecosystem, they often reduce overall biodiversity by driving native species to extinction or reducing their populations.
5. Reject incorrect options: Invasive species do interact with native species and can survive in new environments, making the options about them not affecting native species or being unable to survive incorrect. The correct answer highlights their competitive nature and impact on native populations.