Sterilization and IUDS are effective birth control measures, but lactational amenorrhea may not be so effective.
Why the lactational amenorrhea is not so effective?

Sterilization and IUDS are effective birth control measures, but lactational amenorrhea may not be so effective. How the sterilization precedure of males differ from that of females in preventing pregnancy?

Sterilization and IUDS are effective birth control measures, but lactational amenorrhea may not be so effective. Which part of the female reproductive organ is utilized for the IUD procedure? How this procedure prevents pregnancy?

A bacterial infection was effectively controlled by using a specific antibiotic for a long time. But nowadays this antibiotic is not found to be so effective to control the said infection .Give a scientific explanation for this phenomenon based on evolution.

Why HCl and HI do not show the peroxide effect?