11.   But a captive breeding program under way at the Hope Zoo and six American zoos has failed to produce any offspring, for still unknown reasons.

12.   Even among less extreme advocates of primate rights, the question remains whether animals that are capable of producing viable offspring necessarily should be kept separate at all costs.

13.   He said interbreeding Bornean rhinos with relatives from Sumatra or the Malay peninsula could produce offspring ill-suited to survive and reproduce in the wild.

14.   If certain parents produce more offspring, it could mean they are more fit to survive.

15.   If individuals can interbreed and produce fertile offspring, they belong to the same species.

16.   In its lowest form this is expressed in our passion for a beautiful person and our wish for immortality by producing offspring with that person. . . .

17.   In-breeding is commonplace in the corporate world now, but it still can produce deformed offspring.

18.   Jorgensen returned to her fields the following spring and discovered that this second generation had produced offspring of their own, which continued to be herbicide resistant.

19.   No one need pretend that a failed union that may have produced offspring, fond memories and faithful service never existed.

20.   Nuba women are systematically raped by Arab soldiers in order to produce non-Nuba offspring.