21.   Once birds are three or four years old they begin producing viable eggs.

22.   Other mouth pieces act like sponges to suck up the blood, which the female black fly needs to produce viable eggs.

23.   Relaxin is produced by the ovaries during pregnancy, and IVF drugs which stimulate the ovaries to produce eggs increase the levels.

24.   Researchers focused on ways to get women to produce eggs and on fertilizing the eggs in the laboratory, creating the lucrative business of in vitro fertilization.

25.   Silk comes from the Bombyx mori moth, which produces eggs that evolve into caterpillars.

26.   The females, which seek a blood meal in order to produce eggs, have many different kinds of feeding habits.

27.   The fee should be fixed, the guidelines say, regardless of how many eggs she produces.

28.   The first three times Dawn produced eggs, she said, she produced roughly double that, with only one or two that were not viable.

29.   The high-heat recipe for scrambling defies conventional wisdom but produces perfect eggs.

30.   The main purpose of chickens back then was to produce eggs, he said.