Invasive species are non-native organisms that cause harm to ecosystems, economies, and human health. They often spread through human activities, such as transportation, and can be introduced intentionally or unintentionally. Examples include zebra mussels in the Great Lakes and cane toads in Australia. Invasive plants like the black wattle in South Africa also pose significant threats. Prevention is the most effective method to control their spread, including cleaning boats, not releasing exotic pets, and planting native species. Awareness and proactive measures can help maintain ecosystem balance.

What are some of the consequences of invasive species?

• They have no impact on ecosystems.

• They improve local economies.

• They enhance human health.

• They jeopardize local economies and threaten human health.

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How do boats contribute to the spread of invasive species?

• By preventing the spread of native species.

• By introducing new fish species.

• By carrying non-native organisms like zebra mussels.

• By cleaning the water they travel through.

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What is one of the most notorious invasive species in the United States?

• Asian carp

• Zebra mussels

• Black wattle

• Cane toads

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Why were cane toads introduced to Australia?

• As a form of pest control

• To increase biodiversity

• To improve water quality

• For their medicinal properties

What has been the impact of cane toads in Australia?

• They have increased the number of native predators.

• They have caused a decline in native predators.

• They have improved agricultural productivity.

• They have no impact on the ecosystem.

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Which invasive tree is depleting South Africa's water supply?

• Asian carp

• Zebra mussel

• Black wattle

• Cane toad

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What is the annual global economic cost of invasive species?

• Over a trillion dollars

• Over a hundred billion dollars

• Over a billion dollars

• Over a million dollars

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What is the most effective method to limit the spread of invasive species?

• Relocation

• Prevention

• Introduction of new species

• Eradication

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Which of the following is a preventive measure against invasive species?

• Releasing exotic pets into the wild

• Transferring boats without cleaning

• Planting gardens with native species

• Introducing new species for pest control

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Why is it important to maintain the balance of ecosystems?

• To ensure the survival of invasive species

• To increase the number of non-native organisms

• To prevent the drastic impact of even one invasive species

• To reduce biodiversity

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