i think that's the answer
At each step of using the key, you're given two choices. Each choice leads to another question until the item is identified.
Answer:The fertilized egg attaches to the lining of the uterus. The placenta then develops. The placenta transfers nutrition and oxygen to the fetus from mother. If the egg does not become fertilized, the lining of the uterus (endometrium) is shed during menstruation.
Explanation:hope this helps, i hated health class lol, so hope its not too bad for u!