Biology

The correct answer is D. Invasive species outcompete native species.

Invasive species pose a threat to native species primarily because they often have a competitive advantage in the new environment. They can outcompete native species for essential resources like food, water, shelter, and space. This occurs for several reasons:

1. Lack of natural predators.

2. Adaptations.

3. Aggressive behaviors.

Here's why the other options are not correct:

A. Indicator species are a competition: Indicator species are species that reflect the health of an ecosystem, but they are not typically a form of competition for native species. The real competition comes from the invasive species themselves.

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