21.   We were created by an alien species long ago, and they turned our bodies into something they want to inhabit.

22.   A proposed airport expansion raises concern about an increase in alien species being brought into the park, posing additional threats to native island plants and other species.

23.   Alien species are invading cities, too.

24.   Every alien species is cut down, with stumps painted with herbicide to ensure death.

25.   Florida has already been particularly hard hit by alien species.

26.   Give an alien species two centuries to spread and, experts say, eradication may be impossible.

27.   Recently, alien species carried in the water ballast of merchant vessels have further destabilized the food chain.

28.   So far, like human immigration control, the battle against alien species has been spotty, expensive and largely ineffective.

29.   The measure, put in effect Thursday, seeks to limit human migration and the spread of alien species to the islands and preserve their environmental balance.

30.   The well-intentioned introduction of an alien species can also have serious consequences.