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