Question

why are invasive species dangerous to the environment?
○ they pollute the environment.
○ they are all voracious predators.
○ they threaten biodiversity.
○ they are nonrenewable.

Explanation:

• Option "They pollute the environment": Invasive species don't primarily pollute; pollution is more about contaminants like chemicals, so this is incorrect.
• Option "They are all voracious predators": Not all invasive species are predators (e.g., some are plants that outcompete native flora), so this is false.
• Option "They threaten biodiversity": Invasive species often outcompete, prey on, or disrupt native species' habitats, reducing the variety of life (biodiversity) in an ecosystem. This is correct.
• Option "They are nonrenewable": Invasive species are living organisms and can reproduce, so they aren't nonrenewable (nonrenewable refers to resources like fossil fuels), so this is incorrect.

Answer:

C. They threaten biodiversity.