The following statements are supported by scientific evidence :
- Members of a homologous pair must align with each other at meiosis II for healthy gametes to be produced. The normal cell division cycle (mitosis) is critical in development.
- Drug and alcohol consumption decreases male fertility. Drugs and alcohol may affect the menstrual cycle.
-Sexually transmitted infections can cause infertility. Chlamydia and gonorrhea are sexually transmitted infections that cause infertility.
- Women are fertile from puberty until they permanently stop menstruating. Menopause represents the initiation of the infertile period in women.
-Developmental issues can affect fertility. Developmental disorders may affect the reproductive system and consequently affect the fertility.
-A couple's chances of achieving a pregnancy are reduced by smoking cigarettes. Cigarettes may reduce fertility in women.