Which of the Following Best Describes an Invasive Species

Multiple Choice

Which of the following best describes an invasive species?

A) An invasive species is any non-native introduced species, whether it becomes established or not.
B) Non-native species become invasive when they become established in a new area, taking over niches that were already occupied by native species.
C) Dispersal, even if anthropogenic, is a normal biogeographic process and, therefore, no cause of alarm.
D) Approximately 90% of all introduced non-native species become invasive species.