11.   Instead, Daily suggested that a parasitic fluke left behind by carnivorous birds may be preying on the frog population to complete its reproductive cycle.

12.   The cooler temperatures can also kill off the plankton that anchovies eat, which diminishes stocks and curtails anchovy reproductive cycles.

13.   The directive, adopted unanimously, was intended to protect birds during the reproductive cycle.

14.   The drugs work by blocking a key enzyme used by the human immunodeficiency virus in its reproductive cycle.

15.   The first clock genes were discovered in bread mold and fruit flies, organisms that have highly periodic growth and reproductive cycles.

16.   The pituitary gland pumps it out as part of its role in the amazingly complex ensemble act that is the female reproductive cycle.

17.   The timetable revolves around the reproductive cycles of ticks and white-footed mice, the prime reservoirs of the Lyme bacterium.

18.   The trematode carries out one stage of its reproductive cycle in the gut of predatory birds that dine on frogs.

19.   They can go through a reproductive cycle in as little as two weeks.

20.   They are trying to determine whether human interference affects penguin reproductive success and whether such effects vary in degree through the reproductive cycle.