The main factors affecting birth are:
Age.
Health.
Heredity.
Ovulation cycle.
Location.
Miscarriage
The answer is, “Complementary medicine is treatments that are used along with standard medical treatments but are not considered to be standard treatments. One example is using acupuncture to help lessen some side effects of cancer treatment. Alternative medicine is treatments that are used instead of standard medical treatments.”
C. loud noise or music because infection and injury do not occur often and aging wouldn't make any sense.