Though it can change states, and it often does, what cannot be created or destroyed?
- Correct Answer: matter
- volums
- mass
- water content
Explanation: Then, the muscles of the uterus start contracting. The contractions get stronger and closer together. They may go on for hours. Eventually, the contractions squeeze the baby out of the uterus. Once the baby enters the vagina, the mother starts pushing. She soon pushes the baby through the vagina and out of her body.
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