Mixing chemicals with waste in sewage holding tanks or septic. systems may produce toxic fumes, corrode pipelines and tanks, and. pollute soil and ground water when discharged. When chemicals, such as formaldehyde, are added to septic systems, they can cause. bacteria in the system to die.
The cervix is the opening to the womb. Itâs located between the vagina and the uterus and plays a crucial role in pregnancy and labor. During pregnancy, it remains closed and the opening is blocked with a mucus plug.
A normal pregnancy lasts about 40 weeks. Occasionally, labor begins prematurely, before the 37th week of pregnancy. This happens because uterine contractions cause the cervix to open earlier than normal. Consequently, the baby is born premature and can be at risk for health problems.