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? OK. Let's think. My stream of consciousness:
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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 answer is the wall of the uterus.
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