The Truth About Invasive Species

What is one of the main reasons invasive earthworms are harmful to North American forests?

• They increase soil erosion.

• They eat all the native plants.

• They scare away birds.

• They change the nutrient composition of the soil.

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What makes the sap of giant hogweed dangerous to humans?

• It attracts dangerous insects.

• It contains compounds that can damage DNA when exposed to sunlight.

• It causes allergic reactions.

• It smells bad.

Why were cane toads introduced to Australia?

• To serve as pets.

• To control beetles in sugarcane fields.

• To reduce soil erosion.

• To increase biodiversity.

What is a unique feature of the marbled crayfish?

• They are immune to all diseases.

• They can fly.

• They reproduce asexually.

• They can change color.

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How have aldabra giant tortoises helped the ecosystem in Mauritius?

• By eating invasive plants.

• By spreading seeds of native plants.

• By controlling the population of small mammals.

• By increasing water quality.

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