In addition to having few natural predators, many noxious weeds have means by which they adapt and spread rapidly in new environments.
(many noxious weeds; have; means by which they adapt and spread rapidly in new environments) (they; adapt; ) (they; spread rapidly; L:in new environments)
many noxious weeds they they
have adapt spread rapidly
means by which they adapt and spread rapidly in new environments
L:in new environments