Many introduced species have deleterious effects on
communities and ecosystems because
a. coevolved parasites and competitors are absent.
b. the introduced species are long-lived.
c. predators prefer the introduced species;
therefore, the local prey proliferate to
dangerously high levels.
d. the communities from which they came lost an
important predator, competitor, or parasite.
e. all of these occur.
Answer: a
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