11.   Hormonal changes in women over successive pregnancies could partly explain why firstborns are more likely to develop allergies than their younger brothers and sisters.

12.   Hormonal changes may be at work.

13.   Hormonal changes would have set fire to a hiding cancer.

14.   In addition, mothers have the stress of postpartum hormonal change, while fathers tend to be overwhelmed by financial worries.

15.   In most animal species, however, the role of the father is limited to insemination, so no hormonal change connected with incipient fatherhood would be expected.

16.   In women, the hormonal change at menopause is abrupt and its adverse effects on body organs are well-documented.

17.   Longer daylight hours and warmer water cause the hormonal changes that make fish spawn.

18.   Most pimples happen because of age, heredity, stress and premenstrual hormonal changes.

19.   On six other occasions, she experienced hormonal changes that resembled those of pregnancy but produced no offspring.

20.   Over time, hormonal changes will weaken immune systems, opening the door to sickness.