Question

what is sexual maturation? how does menstruation occur? what is the function of placenta during pregnancy?​

Answer 1

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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.

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