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What happens in the wall of the uterus to push the baby out?
The Baby's waste products are transported through the placenta to the mother's circulatory system and are then filtered by her kidneys. This cycle repeats itself as the baby swallows fluid and...
Each month a lining builds up in the uterus so an egg may implant for pregnancy. When that doesn't happen it sheds and that is menstruation. So, basically each month a woman has a new lining in the...