An alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health is the federal government's definition of:

An alien species whose introduction does or is likely to cause economic or environmental harm or harm to human health is the federal government's definition of:

• A. A quarantine species
• B. A indigenous species
• C. An invasive species
• D. A noxious species

Answer: (C)

The main idea being tested is how non-native organisms are labeled when they have the potential to cause harm and spread. The federal definition describes an alien (non-native) species whose introduction or spread is likely to cause economic or environmental harm or harm to human health. This combination—non-native status plus the likelihood of harm and spread—defines an invasive species. That’s why it’s the best fit: it specifically names a non-native organism whose potential impact and ability to proliferate make it a management concern. Indigenous species are native to the area and not considered invasive by that definition. The term noxious is used in some regulatory contexts to flag pests with regulatory controls, but the standard concept that fits the given description is invasive species. The idea of a quarantine-related category isn’t the official way to name a species in this context, so the invasive label correctly captures both origin and risk.

The main idea being tested is how non-native organisms are labeled when they have the potential to cause harm and spread. The federal definition describes an alien (non-native) species whose introduction or spread is likely to cause economic or environmental harm or harm to human health. This combination—non-native status plus the likelihood of harm and spread—defines an invasive species. That’s why it’s the best fit: it specifically names a non-native organism whose potential impact and ability to proliferate make it a management concern.

Indigenous species are native to the area and not considered invasive by that definition. The term noxious is used in some regulatory contexts to flag pests with regulatory controls, but the standard concept that fits the given description is invasive species. The idea of a quarantine-related category isn’t the official way to name a species in this context, so the invasive label correctly captures both origin and risk.