Stream of consciousness rationale: The important part for answering this question is: In humans, implantation is the stage of pregnancy at which the already fertilized egg adheres to the wall of the uterus.
The question and answer pair are described below.
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Q: In humans, implantation is the stage of pregnancy at which the already fertilized egg adheres to the wall of the uterus. At this stage of prenatal development, the conceptus is called a blastocyst. It is by this adhesion that the fetus receives oxygen and nutrients from the mother to be able to grow.

Answer this question based on the passage: where does an embryo usually attach to its mother?
A: the wall of the uterus
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