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After the egg is released from the ovary it goes down the
1.___________________ where fertilization usually takes place. Then the
fertilized egg moves down to the 2._______________ where it undergoes
development for nine months. This period of development is called
3.___________________.
The developing embryo is surrounded by a protective membrane
called the 4.______________________ and a clear fluid called the
5.____________________.
Needed materials and wastes are exchanged between the embryo
and the mother through the 6._________________