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.
Cervical Length in Early Pregnancy. Cervical length during pregnancy is usually associated with preterm labor that begins before you're 37 weeks pregnant. A premature birth is likely to happen when your cervix is still short. Under normal circumstances, your cervix is rigid and close.